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xExperience reports / Test reports Part 1
Customer reviews of telescopes and accessories:
(I would like to encourage you to share your experience with our products with us. Thank you very much!)
AstroProfessional ED102 714mm f/7
Hello Karl,
I was finally able to thoroughly test the ED you bought!
A great instrument, Saturn at 180x is still razor-sharp, no color at all!
Wide-field observation is especially fun with this thing; stars have very high contrast and are very point-like!
The OAZ runs smoothly, you've done a great job of setting it up, I'm very happy with the telescope!
Best regards,
Andreas
ED-APO ED127 and Explore Scientific Flattner
Hello Karl,
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Kson Ekinox ED1026
Hello Mr. Kloß,
I had the opportunity to use the Kson 1026 the day before yesterday and am very satisfied with its performance. Very bright, clear images without any flaws. I only magnified up to 160x on the moon, but there's certainly much more potential here. In summary, I can say that your advice and the purchase were a very good decision.
Best regards
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Kson Dobson 160mm KDB1300160
Dobson telescope 160/1300 f:8.1 from Kson KDB1300160
Field Report: First Impression
I became aware of the company Teleskop-Spezialisten online when I was looking for a successor to my Bresser 60/800 refractor, which no longer met my requirements.
After comparing the technical specifications in the ¤200 price range, it became clear that a Dobsonian with better optical properties is preferable to all others with more complex altazimuth or equatorial mounts, as high-quality mounts are unavailable in this price range. I know a thing or two about how undersized mounts, like my Bresser, spoil the fun of using a telescope with camera shake.
High-speed refractors are somewhat superior to reflectors in terms of performance, but they are much more expensive.
The countless "114-meter department store reflectors" made in China are no better than my "old 60/800," which I upgraded with a 1.25" Amici-Prima and large eyepieces.
A 150mm Newtonian has about twice the performance of a 114-meter, provided both are of good quality, and that depends on the dealer and their "rework." Since all manufacturers these days either just "assemble" the parts or have them manufactured in Guangdong, you have to look carefully at what you're getting. A great brand name doesn't tell the story.
Now for the Kson 160/1300:
Since I live in Munich, where there are so many telescope companies, I didn't want to have the device shipped to me, but rather inspect it and get my own impression of the quality.
Mr. Karl Kloss from Teleskop-Spezialisten turned out to be a typical old-school "technician" whose main concern is satisfying his customers by delivering a properly checked, optimized, and optimally adjusted device.
The mirror was de-stressed.
Mr. Kloss had to adjust pretty much everything – quality control isn't one of the Chinese companies' strengths. But as long as the quality of the technology is good, it's no problem for me. The whole thing took about an hour and was also a competent introduction to its use.
Parts:
The "rocker box" Dobsonian mount is made of 2-centimeter-thick, white-lacquered melamine resin/wood with a fine texture (not like chipboard) and appears quite stable, which in practice should pay off in terms of minimal backlash. The bearings for the rotation have little play but are still sufficiently flexible. A useful handle and a small tray for eyepieces are provided. The telescope support sits well, but the paint is wearing off there. The overall finish is not of the highest quality. Weight: 12 kg.
The Newtonian has a parabolic mirror made of float glass and, with a 160 mm aperture, is about 6.75% better than the 150 mm – not a world of difference, but still. The 2" focuser is made of solid metal, but a bit bulky, but also suitable for large eyepieces. The mount also looks sturdy. At 1.3 meters long and 21 centimeters in diameter, it's quite a beast. It weighs approximately 6 kg.
With the adapter ring, the two included 1.25mm Super Plössl lenses and the 3x Barlow fit. At a focal length of 1300, this results in magnifications of 52x and 130x.
The red dot finder has been aligned using the teleradar system.
Matching caps are included.
We also recommend a 6mm eyepiece for 217x, which is optimal, and a 32mm eyepiece for 40x deep sky magnification, as well as a lunar filter.
Astrophotography isn't possible with the Dobsonian in this form – except for the moon – but retrofitting it with an NEQ3 mount and motorized tracking is certainly feasible, and then you can also take pictures.
Conclusion:
The Kson For me, as an advanced beginner, the 160/1300 Dobsonian is a superb telescope with a great price-performance ratio.
However, the dedicated rework by telescope specialist Karl Kloss is also responsible for this.
Now it all has to be proven in practice. I'll report back.
Best regards, Friedrich Koob
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Hello Mr. Kloss
Addendum to the last report
Practice:
It took some time until the weather was good enough for an outdoor test. This allowed me to try out the device in dry conditions and optimize it a bit.
-The included 1.25 Super Plössl eyepieces (10, 25, 32) and the 1.8x (not 3x as I initially thought) Barlow lens are better than what is usually included with beginner's accessories. This was also confirmed terrestrially with my "old" refractor compared to the Meade eyepieces (4, 6, 12).
-My initial skepticism about the Barlow (light loss and chromatic aberration) was not confirmed, so I am well equipped for a start.
On both telescopes, they provide a significantly larger, bright, and sharp field of view right up to the edges.
The red dot finder is a bit difficult to adjust because the plastic lining of the adjustment screws doesn't hold. I padded it with some plastic – now it works – but I can't see the rings at dusk, so I also mounted a conventional 6x30 finder (almost new on eBay for ¤12). I'm very happy with the combination now.
On the very sturdy rocker box, I replaced one of the locking screws with a handle from an old angle grinder, which helps with setting the altitude and azimuth tracking. When you turn the tube itself, it vibrates a bit.
I closed the screw holes with white plastic plugs from the hardware store (¤1.80) and filled the gaps around the pivot pin with plastic rings made from old CD spindles to eliminate any play.
Another annoying thing is that the rollers run directly on the paint on the lower wooden disc and literally dig in. I'll glue a thin metal disc (an old lid from a tin bucket) in here, then it'll run more smoothly. If possible, I'll add a degree scale to the edge of the lid and a small bubble level for alignment and leveling.
If I then align it to the north, I can roughly adjust it.
-I got a set of four Meade filters quite cheaply on Amazon.
-On the computer, I use the free Stellarium and the Kosmos Sky Year 2011. You can find a lot of software and literature online.
-For books, I've read Rückl, Picture Atlas of Space, Rückl, Constellations, Corvus, Large Atlas of Stars, a rotating star map, and Roth, Handbook for Stargazers.
Observation:
For the past few days, Jupiter and Uranus have been clearly visible to the south from my conservatory. I know I should choose a better location, but for now, it's enough. Jupiter showed several bands, and Jupiter's moons were razor-sharp points up to 130x with the 10x eyepiece. I'm not sure if Uranus was the same. At 200x magnification, things disappeared too quickly for me, so I still need a lot of practice and a better location.
For me, the 40x to 100x magnifications are more important than the maximum 320x with the 4x, for which I need a location somewhere on a mountain anyway.
The Moon was too full for serious observation, but the progress towards a refractor is clear.
The same applies to the Orion Nebula.
I didn't notice any reflections, and whether I could improve them further with black velvet film is questionable.
In any case, the instrument is very well adjusted and meets my expectations.
Best regards, Friedrich Koob
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Kson Dobsonian 80mm
Hello Karl!
As discussed, here's my experience with the small Dobsonian:
The small Kson Dobsonian (80/500) arrived (after one day of delivery), very well packaged, and safe and sound.
Assembling the mount took only a few minutes thanks to the excellent fit. The necessary tools are included!
The mount is made of very sturdy, white-painted plywood. The plate for the tube is additionally reinforced with a fin that houses a handle. The roller bearings in the azimuth can be easily adjusted using a handy knurled nut.
The Dobsonian was already properly pre-adjusted; it only took a few minor adjustments to the star to produce a good diffraction pattern!
The red dot finder is good and has two switchable brightness levels.
The two included eyepieces, a 25mm and a 10mm Plössl, are multi-coated and of good quality! Not those junky eyepieces you usually get at this price!
Included is a 3x plastic Barlow lens, but with an achromatic element.
The Barlow lens's imaging properties are good, but considering the 500mm focal length (f6.3), a 2x lens would have been sufficient here.
With a 4mm eyepiece (from my stash), the image was surprisingly sharp and high-contrast at 125x magnification.
It's certainly fun to explore the Milky Way with the 25mm eyepiece at 20x magnification; the image is sharp right to the edges! But it also performs quite well on planets!
All in all, a successful mini Dobsonian, with great features, for quick spotting in between, or when I'm too lazy to get my 10-inch telescope out of the basement and then have to wait another hour for it to cool down.
Best regards,
Frank
Hello Mr. Kloss!
After some time has passed, I recently had the opportunity to test the KSON. I have to say, this is my first reflector telescope. However, one thing you can probably judge even without any experience with reflectors is the packaging. And that was already good. Then the assembly: no problem. I just noticed that the images in the manual were more or less black on a black background, in short: barely legible. On the other hand, I didn't need the manual for assembly (I hope so!). One negative aspect was that the screws for the roller bearings had already developed a lot of surface rust.
Once fully assembled (certainly less than half an hour), you have a pleasing device in front of you that is easy to use and adjust. A first glance through the eyepiece during the day at a few nearby trees astonished me: this thing is really good! The image was, in my opinion, clear and high-contrast, and above all, amazingly sharp at the edges. And definitely better than I expected.
A few days later, I had the opportunity to test the KSON against the starry sky. The first thing that impressed me was the edge sharpness during general "star surfing." The device was easy to adjust and guide. A look at the Andromeda Nebula as a specific object was also completely satisfactory, which, given my viewing conditions (city, ground floor, and plenty of street lighting), meant that the nebula was immediately visible. With an 8x30 binocular in the same price range, you have to look twice with indirect vision. Overall, the "image aesthetics" were really good, and I was pleasantly surprised by what the small aperture offered in terms of sharpness and contrast.
So, I would recommend this device as an astroappetizer. It lets you see more than you think and less than you'd like. I think it's worth the money and, both optically and mechanically, absolutely useful for your first steps.
Always a clear view, and thanks again for the device.
Dear Mr. Kloß,
Positive: The red dot finder was aligned in an instant and now reliably shows the way.
Contrary: As soon as an eyepiece was in the holder, the height adjustment didn't hold. You really have to "clamp" the corresponding locking wheel; now the height adjustment works even with heavy eyepieces. The adjustment is a bit jerkier than with my Dobsonian, but after a short time, you get a feel for the force required to adjust it.
Positive: The focus is positioned such that the drawtube doesn't protrude into the tube when the image is sharp; unfortunately, this isn't the case with all tubes.
The two included eyepieces are quite decent and produce an image of the moon that has already impressed a few neighbors. The included Barlow lens is quite mediocre; with a short 2x Barlow lens from Seben, the image was significantly better at the same magnification, especially at the edge of the field of view.
I've tried various other eyepieces besides the ones included. With a 32mm Plössl, the tube is a bit overwhelmed; it's difficult to ignore the secondary mirror. It handles a 25mm wide-angle lens without complaint and produces a beautiful image with a quite pleasant field of view. The magnification could be increased to over 100x, and focusing and changing the eyepieces was successful without the object disappearing. In this respect, the Kson is clearly superior to any Tschiboscope or similar, making it much more suitable for beginners. The eyepiece storage holes are a bit small for current eyepieces; I'll sand them down with sandpaper in due time.
Conclusion: The Kson is a device that can be easily recommended to beginners. We will, of course, do the same at the Astronomy Day. It's more than enough for casual observers, and others will develop a preference for a larger Dobsonian over time.
For now, I thank you for everything and remain with best regards from astrophysics,
Gerhard Schmitt
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100mm f/10 (1000mm) Maksutov-Cassegrain Gamma MC 4" f/10
Hello Mr. Kloß,
Today I would like to share my experience report with you on the 102mm Rumak from Bosma. You adjusted the unit perfectly, and the diagonal mirror also improved after your intervention. At 33cm long, this unit is really handy, even though it feels quite solid when held in your hand. I can use the dovetail rail with the photo tripod connections for my alt-azimuth and equatorial mounts. Both should be quite stable, as you'll likely be moving beyond 100x magnification with this Maksutov. As an f/10 unit, it can also achieve slightly larger exit pupils and is also suitable for use in deep sky observation.
I also added a flexible dew shield to the unit, which I lined with velour to suppress reflections. I have.
But let's get down to business: In winter, I cool the device down for 45 minutes before starting observations. This is worthwhile, because sharpness and contrast increase enormously when the device is at a reasonable temperature. Mars is currently at opposition, and although not particularly large this time, I targeted it first. With 125x magnification, the northern polar cap was clearly visible, as were the dark areas. The sharpness and the subtle contrast differences on the Martian surface were impressive. It's a pity I don't have an eyepiece for higher magnification. The contrast on the moon was also very striking – I had never seen the lunar surface so richly shaded before – it wasn't just the craters that fascinated me here.
Since my greater interest lies in deep-sky observation, I naturally targeted a few objects here as well. Incidentally, I like to use a red dot finder. The trapezoid in Orion was clearly visible at 100x or 125x magnification, but what was almost more fascinating was the Nebula structure around the Trapezium at 125x magnification. Here, the nebula's structures were visible as fibers, and the dark areas were finely defined. A beautifully high-contrast image.
In addition to the well-known Eskimo Nebula (planetary nebula), I finally brought the M38/NGC1907 duo in the Charioteer into view. This view was fantastic. With a 19mm eyepiece (53x magnification, 1.2° real field of view), the large M38 with its rows of stars and the small, cloud-like NGC1907 next to it could be seen simultaneously. These two objects look very different, and against the pitch-black sky, I didn't feel the need to increase the magnification. With averted vision, individual stars in NGC1907 were already visible even at this magnification.
Overall, it's a very portable instrument with remarkable contrast and very high sharpness. This is where careful adjustment in the telescope workshop and good optics really pay off. The instrument should be well-suited to If the telescope is adjusted to the ambient temperature (like any closed-mirror system), this will result in a further noticeable boost in image sharpness. The focal length of 1000mm at a 102mm aperture still allows for good fields of view and exit pupils, so I can also use the telescope for my deep-sky observations.
Best regards and clear skies,
Stefan Deichsel
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UWA 82° Eyepiece
A report on the UWA 6.7mm and 11mm 82°
Hello Charly;
I observed again yesterday with your eyepieces (UWA 82°, 6.7mm, and 11mm). I'm not an eyepiece expert, but I hope I can give you some honest information:
Now for the results:
The positive aspects:
1) Optically and qualitatively excellent workmanship and packaging
2) Even on the moon, in very bright light, there are no color fringes on edges or craters / not even a hint of them (very nice)
3) Stars are pin-thin and sparkling, no stray light is visible; The inner blackening is very well executed
4) Very sharp image up to 4/5 of the field of view, with only a slight loss of sharpness at the very edge.
5) Fits very precisely into my 1 1/4" reducer on the telescope and doesn't wobble or catch when you want to remove them.
6) The weight is still reasonable at 82° for the 6.7mm and 11mm.
The less positive aspects:
1) The rotating support is very stiff in cold temperatures, and the eyepiece usually rotates with it (you have to tighten it very tightly); perhaps a bit too much grease.
2) When the support is turned out, the 82° angle is very difficult to see (especially difficult for eyeglass wearers).
3) The smooth shape makes it easier for the eyepieces to slip out of your hand in cold temperatures and makes it more difficult to rotate the support.
So, that's it for now. I'm really happy with both focal lengths.
I hope there's something useful for you, otherwise you can You still have questions about specific observation types or objects.
I'll try it out for you and report back.
Best regards and CLS
Manfred
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UWA 30mm 82° Eyepiece
A review of the UWA 30mm 82°
I'd like to preface this review by saying that although I've been pursuing astronomy as a hobby for over 10 years, I'm no expert in eyepiece testing and can only express my subjective opinion here.
When the UWA 82° eyepiece I ordered arrived last week, I naturally unpacked it right away, and when I finally got it in front of me, I was a bit apprehensive. The eyepiece was even larger than I imagined. The kitchen scales showed a little over 1300 grams. Visually, it made a sophisticated impression; everything was cleanly crafted. The eyepiece sleeve had a locking groove, and the lenses shimmered with a green coating. The eyepiece is missing the rubber caps for stray light suppression. This problem is solved in a different way. The field lens of the eyepiece is virtually submerged in the eyepiece by twisting the eyepiece body, and this can be done continuously, allowing anyone to determine the desired depth themselves. I found this very practical, as everyone is familiar with the problem of lost rubber cups.
After inspecting it externally, I wanted to give it a first test. I inserted it into my 250/4.8 Newtonian and pointed the optics at the Berlin TV tower in daylight. The red and white transmitting antenna provides a good comparison of the eyepiece's field of view. For comparison, I used my 30 mm Baader eudiascopic lens, which, of course, is no match for field size, but at most in terms of sharpness and transparency. In these cases, it is recognized as good to very good. A look through the two eyepieces showed me for the first time how small the Baader's field of view actually is compared to the UWA.
I found the viewing behavior of the UWA eyepiece to be pleasant, with a nice eye relief. The only disadvantage here was the size. When you approach the eyepiece, your nose touches the eyepiece. This requires you to turn your head slightly away from the optical axis of the eyepiece and compensate for this twist with your eyes. So, you're not looking completely straight. Once you get used to it, though, it shouldn't be a problem. I also found it pleasant that you could rest your head lightly on the eyepiece while observing, which resulted in a very relaxed posture. The lowered lens also eliminated the risk of your eyelashes getting grease on the eyepiece.
The focus position of the UWA was still slightly behind that of the Baader. Therefore, the telescope focuser should have some space at the back. Or you could use an extension tube, as I did.
That same evening, I also had time to compare the two eyepieces on my balcony observatory. M27 was quickly found in the Baader. It wasn't exactly stunning under the Berlin sky, but it was still clearly visible. The view through the UWA showed almost the same view. M27 was just as easy to see, but in a much larger field. My next object was the Ring Nebula in Lyra. Although it's very small, it's brighter and therefore easy to find even on the outskirts of Berlin. The Baader showed it as a tiny little smoke ring. Here, too, the only difference compared to the Baader was that M57 was in a much larger field in the UWA. The field of view extended beyond the two "foot stars" of Lyra, making for a beautiful view. The separation between the two stars in the sky is just over 2°, so I now knew roughly how many degrees the eyepiece was showing me in the sky. I could also see how sharply the stars were imaged across the entire field of view. I only noticed a slight coma in the outermost part of the field of view, similar to the coma of the Baader, but it was no longer noticeable as a distraction during observation. In my opinion, the image aesthetic was no longer impaired by comet-like star formations.
Finally, I panned to the moon, which was only three-quarters illuminated. Comparing the two eyepieces, the Baader scored slightly higher in terms of sharpness. The UWA didn't appear out of focus on the moon, but the Baader's image was a bit crisper. Towards the end of the evening, a few clouds slowly but surely rolled in. Then came the UWA's big moment. The moon was in the large field of view, and the clouds moved in front of it like a theater curtain. Simply beautiful. This further reinforced the already positive impression. I'll definitely be there for the HTT in September. Perhaps I can test it directly against the 31mm Nagler under a really dark sky. I'll also have a 2-inch UHC filter, so even more challenging nebulae will be within range of my 10-inch Newtonian.
Michael Barchmann
"NoName" ED127
Hello Mr. Kloss,
A friend of mine has a TEC 140, and last night we placed the TEC and the 127ed apo side by side and compared them. We were in the city, so the Orion Nebula was the same in both with OIII, as was the double star Rigel, although the companion was a bit brighter in the TEC (slightly wider aperture).
On the Moon, the images with the 127ed were almost identical to those of the TEC 140. The four craterlets in Plato were all clearly visible with a 3.5 mm Nagler. The grooves around Ramsden were also very beautiful. I took AVIs of Clavius with the camera (Canon Powershot) behind a 7 mm Nagler at 4x zoom, and edited both the same way in Registax and Photoshop. I'll send you the images for comparison; in both, you can see all the craters in Clavius listed in the Rukl atlas. You can tell me if you see a difference.
My friend was very impressed, especially when he mentioned the price difference!
I can safely say that the 127ed triplet offers value for money!
Sincerely,
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"NoName" ED102
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Hello Mr. Kloß,
Yesterday I was able to enjoy a wonderful first light with my ED 102. The first glimpse of low-lying Jupiter showed more details in the cloud bands than with the 90mm refractor, but the cooling time is also a bit longer, which I hadn't considered before.
Since the moons were all adjacent to Jupiter, I moved on to the double stars. First, I looked at Gamma Del (4m3/5m1 9.2") and Struwe 2725 (7m5/8m0 6.1"), which fit nicely together in the field of view of the TS 15mm SW eyepiece and were clearly visible at 47x magnification. The varying brightness of the double stars made for an interesting sight. Then I moved on to Epislon Lyre, where all four components were clearly visible in the Hyperion 5mm eyepiece. M57 was visible as a beautiful smoke ring. I checked the diffraction rings on Vega, and it looks very good; there are no signs of distortion, coma, or anything like that; adjusting the optics was worth it.
I then moved toward Rho Her (4m5/5m5 4.2"), which was already separated at 10mm with the zoom eyepiece. I also briefly passed M13, which showed individual stars resolved at the edge, but the rising moon was noticeable. M26 and M27 also looked less impressive. So, off to the moon. I then focused on it and observed the Jansen crater. Rimae Jansen was also very clearly visible. In the Hyperion 5mm eyepiece at 142x, it was a very beautiful sight with many details in the crater. The craters Fabricius and Mitrius, which were still half in shadow, were also very nice to observe. Even with the Hyperion 3.5mm at 204x, the image was very high-contrast and clear. I couldn't see any colors.
After about 3 hours of first light, I took down my telescope and went into the warmth of my house. I think I bought a decent telescope with good optics for the price. The OAZ runs smoothly and smoothly, and the 1:10 gear ratio works very well. Only the dew cap and the principle of having to mount it upside down for transport take some getting used to. Otherwise, with the large carrying case, it's a good set.
Best regards to Munich
Markus W.
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Hello Mr. Kloß,
Yesterday I was able to observe again, and when it came to the view of the moon, I can only say it was unique. I've never seen so many individual structures visible in the crater walls alone with any of my telescopes before. Even craters that aren't on the terminator are now worthwhile objects to observe. So, once again, I'd like to express my sincere gratitude for the excellent adjustment of the telescope; the effort was worth it.
Best regards
from Mülheim
Markus W.
Hello,
After finally managing to take a look through my 102mm f/7 (700mm) ED APO triplet refractor, I'm more than thrilled. It's perfectly calibrated and has a really good image. Observing with this device is truly a pleasure. I've been using the APO for visual solar observation so far and will soon be using it for photography as well. A trip to the moon was simply a delight; no color fringing was noticeable. Since I was immediately overconfident, I attached my unmodified Canon 450d and, without guiding, pointed it at the Orion Nebula near the edge of the Ruhr area. With an NEQ6 and just the APO attached, I then took 12 x 20-second exposures and ended up with this result: my first astrophotography.
I hope I can get more good shots with the APO and would like to thank you again for the advice.
Regards, Ralf Schmidt
Feedback geben
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Weitere Erfahrungsberichte unter "Teil 2"!
(I would like to encourage you to share your experience with our products with us. Thank you very much!)
AstroProfessional ED102 714mm f/7
Hello Karl,
I was finally able to thoroughly test the ED you bought!
A great instrument, Saturn at 180x is still razor-sharp, no color at all!
Wide-field observation is especially fun with this thing; stars have very high contrast and are very point-like!
The OAZ runs smoothly, you've done a great job of setting it up, I'm very happy with the telescope!
Best regards,
Andreas
ED-APO ED127 and Explore Scientific Flattner
The shooting data:
5 x 5 minutes with an unmodified Canon 1000D on an unmodified EQ6 Skyscan.
Guiding with an 80/400 guide scope and AlCCd5V and Guidemaster.
The OA is the smaller one, as I can no longer get visual focus with the large one using the 31mm Nagler.
(minimal vignette)
I focused using a Hartmann mask on the 1000D's live display. I didn't want to spend ages fiddling around. I think the focus isn't bad, though maybe not 100%.
The seeing wasn't bad; relatively steady but far from perfect. Visually, I couldn't zoom in very high, even though the image was still (high layers of air?...). Perhaps that's also why the focus doesn't seem perfect.
Image editing only involves the following steps:
Alignment and stacking (ImagesPlus)
Gradation curves and tonal correction (Photoshop)
Removal of minimal vignetting and slight background noise (GradientX and Noiseware prof.)
Light wavelet sharpening with PixInside.
Gradation curves again.
What I haven't done anything to are the stars and the "colors/haloes" of the stars.
This is 100% as they appear behind the flattener from the ED127.
SkyWatcher Evostar 90/900
Hello Mr. Kloß,
After the 90/900 refractor arrived on Wednesday and an initial inspection of the device was completely satisfactory, I had the opportunity to test the device in the sky over the last two days. I'm thrilled; my expectations have been exceeded!
I actually expected that the refractor would run out of steam at 130x - 140x magnification (AP less than 0.7) due to the chromatic aberration caused by the relatively large aperture ratio of f/10 for a 90mm refractor, meaning that the sharpness would deteriorate significantly. But that wasn't the case.
On Saturn, my 6mm UWA eyepiece showed a razor-sharp image, and even at 5mm (RK 10mm + 2x Barlow), i.e., 180x magnification, the planet could still be focused sharply and clearly, although the image became a bit dark. And that's at Saturn's low altitude at midnight.
I attribute this outstanding result primarily to your excellent adjustment of the refractor. It shows that I was right to choose a device with individual quality certification, especially since you perform this inspection and adjustment free of charge – a service that can easily cost 100 euros or more from other retailers!
The Evostar will definitely become my primary telescope, at least on my balcony. The Evostar 90/900 finally won me over last night when I was able to cleanly separate the Alnitak (Zeta Orionis) into its two components through the 4mm eyepiece (225x magnification!).
Thank you also for the free dovetail rail you installed on the OTA. With you, the customer truly is king.
Best regards,
Harald E.
5 x 5 minutes with an unmodified Canon 1000D on an unmodified EQ6 Skyscan.
Guiding with an 80/400 guide scope and AlCCd5V and Guidemaster.
The OA is the smaller one, as I can no longer get visual focus with the large one using the 31mm Nagler.
(minimal vignette)
I focused using a Hartmann mask on the 1000D's live display. I didn't want to spend ages fiddling around. I think the focus isn't bad, though maybe not 100%.
The seeing wasn't bad; relatively steady but far from perfect. Visually, I couldn't zoom in very high, even though the image was still (high layers of air?...). Perhaps that's also why the focus doesn't seem perfect.
Image editing only involves the following steps:
Alignment and stacking (ImagesPlus)
Gradation curves and tonal correction (Photoshop)
Removal of minimal vignetting and slight background noise (GradientX and Noiseware prof.)
Light wavelet sharpening with PixInside.
Gradation curves again.
What I haven't done anything to are the stars and the "colors/haloes" of the stars.
This is 100% as they appear behind the flattener from the ED127.
SkyWatcher Evostar 90/900
Hello Mr. Kloß,
After the 90/900 refractor arrived on Wednesday and an initial inspection of the device was completely satisfactory, I had the opportunity to test the device in the sky over the last two days. I'm thrilled; my expectations have been exceeded!
I actually expected that the refractor would run out of steam at 130x - 140x magnification (AP less than 0.7) due to the chromatic aberration caused by the relatively large aperture ratio of f/10 for a 90mm refractor, meaning that the sharpness would deteriorate significantly. But that wasn't the case.
On Saturn, my 6mm UWA eyepiece showed a razor-sharp image, and even at 5mm (RK 10mm + 2x Barlow), i.e., 180x magnification, the planet could still be focused sharply and clearly, although the image became a bit dark. And that's at Saturn's low altitude at midnight.
I attribute this outstanding result primarily to your excellent adjustment of the refractor. It shows that I was right to choose a device with individual quality certification, especially since you perform this inspection and adjustment free of charge – a service that can easily cost 100 euros or more from other retailers!
The Evostar will definitely become my primary telescope, at least on my balcony. The Evostar 90/900 finally won me over last night when I was able to cleanly separate the Alnitak (Zeta Orionis) into its two components through the 4mm eyepiece (225x magnification!).
Thank you also for the free dovetail rail you installed on the OTA. With you, the customer truly is king.
Best regards,
Harald E.
KSON Eklipse Ekcentric ALT-AZ Mount:
I've been the happy owner of the KSON Eklipse mount for six weeks now, and I have to say I'm more than satisfied with it.
In my career as an amateur astronomer, I've "suffered through" pretty much every goto mount, whether it's one where you only have to aim at "three bright stars" or one where the location is determined via GPS and then the telescope has to be aligned to, for example, Adebar in Stork or Al-Qaeda...more or less rubbish, even if it says C. or M.
I don't know HOW, but I've found THAT the Kwon mount does what you want it to:
Set it up or get it out of the shed or trunk, attach the telescope, connect the battery pack and handset, turn it on, aim at ONE bright celestial object, press OK - that's it. Even if the "bright celestial object" is the moon, you can enjoy your night of observation.
I have two complaints:
a) The rather "rustic" construction, which doesn't affect its functionality, and
b) the connection between the handset and the mount is made via a USB connector, which is a bit too easy to insert and therefore sometimes creates loose connections, which then requires realignment. A piece of tape helps with this.
Something else that might be important for allotment owners and balcony watchers:
The thing doesn't squeak or whine during alignment and is whisper-quiet during observation – good for avoiding neighborhood wars, in my experience.
"When the handset is turned on, a warning appears on the display that looking at the sun is not good for your eyesight...as far as I know, all control systems do this, after presumably an American came up with this nonsense and successfully sued the manufacturer for tens of millions of dollars in damages.
You acknowledge this warning by pressing the OK button and begin the alignment procedure, for example, at 12:00 noon. "Sun" is suggested as the "Bright Object," and that's exactly what you aim for (don't forget a Herschel prism, Baader foil, or Televue Solar Finder!). After "Align successful," enter "Venus" and observe it in the daytime sky.
Try THAT with a different mount."
Conclusion:
If word gets around about the existence and ease of use of this device (apart from the price), C. and M. will have to come up with something.
Sincerely,
Hello,
The telescope must be mounted on the left side when facing the object you want to observe.
As you said, it's a simple mount without a lot of bells and whistles, which is simply fun!
You're up and running in 2 minutes - and the tracking and positioning is very good!
The menu navigation on the hand control is also more or less self-explanatory!
Astro Professional ED80/560
Hello Mr. Kloß,
The telescope arrived today well packaged, neatly crafted, superbly adjusted, crystal-clear lenses, simply perfect, thank you for your effort! I was just able to observe Saturn at 160x; the image is absolutely clear and sharp, with clearly visible Cassini divisions, the ring in front of the planet with a shadow, the planetary sphere practically floats within the ring, and darkening with contrasting gradations at the two poles are also clearly visible! The spherical correction is extremely good, and the optics have surprisingly little color for an ED! So, I'm completely satisfied with the device; a really good addition to my 8" F6 Newtonian from Orion UK! I will definitely recommend it!!
Best regards, Uwe
I've currently bought the ED 80/560 from Astro Professional from you for this mount!
Due to weather conditions, I haven't been able to observe very often yet, but I'm very satisfied with the performance of the 80 mm refractor!
The refractor has a very sharp image. The stars are imaged perfectly as pinpoints.
Observing nebulae with the Televue 8 mm is absolutely fantastic! The focuser is very smooth and can be adjusted precisely - with the gear ratio, exact focusing is possible! I bought this refractor and the mount more or less as travel equipment!
But I don't think I'll use both just for travel! In my opinion, the refractor has an imaging performance that (as a non-astrophotographer) might be tempted by - of course, on the other side. Mount!
In summary, the consultation, adjustment, and delivery were perfect!
Best regards
I've been the happy owner of the KSON Eklipse mount for six weeks now, and I have to say I'm more than satisfied with it.
In my career as an amateur astronomer, I've "suffered through" pretty much every goto mount, whether it's one where you only have to aim at "three bright stars" or one where the location is determined via GPS and then the telescope has to be aligned to, for example, Adebar in Stork or Al-Qaeda...more or less rubbish, even if it says C. or M.
I don't know HOW, but I've found THAT the Kwon mount does what you want it to:
Set it up or get it out of the shed or trunk, attach the telescope, connect the battery pack and handset, turn it on, aim at ONE bright celestial object, press OK - that's it. Even if the "bright celestial object" is the moon, you can enjoy your night of observation.
I have two complaints:
a) The rather "rustic" construction, which doesn't affect its functionality, and
b) the connection between the handset and the mount is made via a USB connector, which is a bit too easy to insert and therefore sometimes creates loose connections, which then requires realignment. A piece of tape helps with this.
Something else that might be important for allotment owners and balcony watchers:
The thing doesn't squeak or whine during alignment and is whisper-quiet during observation – good for avoiding neighborhood wars, in my experience.
"When the handset is turned on, a warning appears on the display that looking at the sun is not good for your eyesight...as far as I know, all control systems do this, after presumably an American came up with this nonsense and successfully sued the manufacturer for tens of millions of dollars in damages.
You acknowledge this warning by pressing the OK button and begin the alignment procedure, for example, at 12:00 noon. "Sun" is suggested as the "Bright Object," and that's exactly what you aim for (don't forget a Herschel prism, Baader foil, or Televue Solar Finder!). After "Align successful," enter "Venus" and observe it in the daytime sky.
Try THAT with a different mount."
Conclusion:
If word gets around about the existence and ease of use of this device (apart from the price), C. and M. will have to come up with something.
Sincerely,
Hello,
The telescope must be mounted on the left side when facing the object you want to observe.
As you said, it's a simple mount without a lot of bells and whistles, which is simply fun!
You're up and running in 2 minutes - and the tracking and positioning is very good!
The menu navigation on the hand control is also more or less self-explanatory!
Astro Professional ED80/560
Hello Mr. Kloß,
The telescope arrived today well packaged, neatly crafted, superbly adjusted, crystal-clear lenses, simply perfect, thank you for your effort! I was just able to observe Saturn at 160x; the image is absolutely clear and sharp, with clearly visible Cassini divisions, the ring in front of the planet with a shadow, the planetary sphere practically floats within the ring, and darkening with contrasting gradations at the two poles are also clearly visible! The spherical correction is extremely good, and the optics have surprisingly little color for an ED! So, I'm completely satisfied with the device; a really good addition to my 8" F6 Newtonian from Orion UK! I will definitely recommend it!!
Best regards, Uwe
I've currently bought the ED 80/560 from Astro Professional from you for this mount!
Due to weather conditions, I haven't been able to observe very often yet, but I'm very satisfied with the performance of the 80 mm refractor!
The refractor has a very sharp image. The stars are imaged perfectly as pinpoints.
Observing nebulae with the Televue 8 mm is absolutely fantastic! The focuser is very smooth and can be adjusted precisely - with the gear ratio, exact focusing is possible! I bought this refractor and the mount more or less as travel equipment!
But I don't think I'll use both just for travel! In my opinion, the refractor has an imaging performance that (as a non-astrophotographer) might be tempted by - of course, on the other side. Mount!
In summary, the consultation, adjustment, and delivery were perfect!
Best regards
Hello Karl,
As promised, I'm writing my first observation report here. Last night I observed the double star Rigel, Mercury, M42, and Saturn. Mercury was best at 93x in the 6mm planetary eyepiece; the crescent was very clearly visible, a good image despite its low elevation of 5 degrees. Rigel was very easy to separate with two pinpoint stars; the optics are truly superb. Then there was M42, which I've seen several times in my 12" Dobsonian, but the "little refractor" still fascinates with its sharp, high-contrast image. At 93x, the trapezoid was very well resolved, and M42 revealed rich structures. Later, when Saturn finally appeared in the south, I could hardly wait to observe it in more detail. The image at 140x was very sharp and high-contrast; the dark polar region was visible, and the main cloud band was also very clearly visible. My expectations were far exceeded. Now I became curious and wanted to know how much I could magnify without losing detail. At 175x, the image was darker, but all the details were still there; the image was still very good. Then I became overconfident: 224x. I was amazed. The image hadn't collapsed yet, but it was already quite dark. The sharpness was no longer perfect, but still OK. You can tell that you're observing well beyond the optimal magnification, but the details were still all there. Today I observed the sun. In short, I was thrilled! Numerous spots were visible, and the refractor also shows the granulation on the sun! At 112x, I had the best image; the seeing wasn't very good, rather mediocre. And the refractor is also great for observing the earth; the image is bright, high-contrast, and sharp. Overall, my expectations have been far exceeded; I'm amazed at what "only" 80mm aperture can show.
Kind regards, Patrick
SkyWatcher SC11
So a bit of a review.
The SW C-11 OTA arrived nicely packaged with a big finder, 32 mm Plossl, good diagonal and the visual back. The scope was noticeably bigger and heavier than the C8 I had before. I've installed the OTA on HEQ5 mount and noticed that I need more counterweights. Adding 5kg more (~16kg total) allowed to balance the scope, but I'm planning to use fewer counterweights on an extender counterweight shaft/bar. On my balcony on vibration suppression pads the mount worked without any problems when imaging Saturn and Venus. No changes compared to the C8 setup. Long time guided exposures haven't been tested yet.
As for the SW C-11 OTA - it has SkyWatcher logo on the side and Celestron logo on the secondary and finder so it's clearly the same design. The factory probably saves time by not rebranding smaller elements for these scopes. The diagonal compared to a standard cheap Antares gives brighter flashlight image and green coatings can be detected. Plossl eyepiece also looks like nicely done, probably by GSO (the same look).
Focus knob on the C11 has more pressure on it than in C8 (heavier mirror to move) and it moves the mirror slower than in the smaller SCT. It probably limits shaking of the mirror but sometimes it's hard to tell if I'm focusing or defocusing. For imaging I also use JMI motocryford attached to the SCT thread - that allows fine focus without moving the mirror. I had only one clear night with this scope and when imaging Saturn and Venus in the morning I didn't notice any problems with mirror flop. It was steady and there wasn't any unexpected lost of focus. How it will perform on long-term imaging - time will tell ;)
ToDo is to get a dew shield, bahtinov mask and maybe 11" solar filter, checking the extended counterweight bar, guiding (and some new filters :)) The scope will do it's job (I hope). First images obtained at rather poor seeing:
http://www.rkblog.rk.edu.pl/astro/my_astro_images/show/wenus-17122010/
http://www.rkblog.rk.edu.pl/astro/my_astro_images/show/saturn-17122010/
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Ekinox (Kson) ED805.5
The sky conditions that evening were fair for a city location down to mag 5 (England).
Filter: The filters used for the Horsehead nebula was a composition of R G B for color information and an Astronomick H Alpha filter for the image luminance.
Exposure: The exposure times was twenty minutes for each color filter and two hours in H Alpha. The exposures was a composition of two minute exposures stacked with matching dark frames using deep sky stacker software and retouched up on Paint Shop Pro software.
Camera: The camera was an Atik 314L CCD camera
Mount: mount was a Vixen Atlux mount .
Scope: Ekinox (Kson) ED805.5
This recording was made with an ED805.5 that had not yet been adjusted.
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Kson Ekinox ED1026
Hello Mr. Kloß,
I had the opportunity to use the Kson 1026 the day before yesterday and am very satisfied with its performance. Very bright, clear images without any flaws. I only magnified up to 160x on the moon, but there's certainly much more potential here. In summary, I can say that your advice and the purchase were a very good decision.
Best regards
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Kson Dobson 160mm KDB1300160
Dobson telescope 160/1300 f:8.1 from Kson KDB1300160
Field Report: First Impression
I became aware of the company Teleskop-Spezialisten online when I was looking for a successor to my Bresser 60/800 refractor, which no longer met my requirements.
After comparing the technical specifications in the ¤200 price range, it became clear that a Dobsonian with better optical properties is preferable to all others with more complex altazimuth or equatorial mounts, as high-quality mounts are unavailable in this price range. I know a thing or two about how undersized mounts, like my Bresser, spoil the fun of using a telescope with camera shake.
High-speed refractors are somewhat superior to reflectors in terms of performance, but they are much more expensive.
The countless "114-meter department store reflectors" made in China are no better than my "old 60/800," which I upgraded with a 1.25" Amici-Prima and large eyepieces.
A 150mm Newtonian has about twice the performance of a 114-meter, provided both are of good quality, and that depends on the dealer and their "rework." Since all manufacturers these days either just "assemble" the parts or have them manufactured in Guangdong, you have to look carefully at what you're getting. A great brand name doesn't tell the story.
Now for the Kson 160/1300:
Since I live in Munich, where there are so many telescope companies, I didn't want to have the device shipped to me, but rather inspect it and get my own impression of the quality.
Mr. Karl Kloss from Teleskop-Spezialisten turned out to be a typical old-school "technician" whose main concern is satisfying his customers by delivering a properly checked, optimized, and optimally adjusted device.
The mirror was de-stressed.
Mr. Kloss had to adjust pretty much everything – quality control isn't one of the Chinese companies' strengths. But as long as the quality of the technology is good, it's no problem for me. The whole thing took about an hour and was also a competent introduction to its use.
Parts:
The "rocker box" Dobsonian mount is made of 2-centimeter-thick, white-lacquered melamine resin/wood with a fine texture (not like chipboard) and appears quite stable, which in practice should pay off in terms of minimal backlash. The bearings for the rotation have little play but are still sufficiently flexible. A useful handle and a small tray for eyepieces are provided. The telescope support sits well, but the paint is wearing off there. The overall finish is not of the highest quality. Weight: 12 kg.
The Newtonian has a parabolic mirror made of float glass and, with a 160 mm aperture, is about 6.75% better than the 150 mm – not a world of difference, but still. The 2" focuser is made of solid metal, but a bit bulky, but also suitable for large eyepieces. The mount also looks sturdy. At 1.3 meters long and 21 centimeters in diameter, it's quite a beast. It weighs approximately 6 kg.
With the adapter ring, the two included 1.25mm Super Plössl lenses and the 3x Barlow fit. At a focal length of 1300, this results in magnifications of 52x and 130x.
The red dot finder has been aligned using the teleradar system.
Matching caps are included.
We also recommend a 6mm eyepiece for 217x, which is optimal, and a 32mm eyepiece for 40x deep sky magnification, as well as a lunar filter.
Astrophotography isn't possible with the Dobsonian in this form – except for the moon – but retrofitting it with an NEQ3 mount and motorized tracking is certainly feasible, and then you can also take pictures.
Conclusion:
The Kson For me, as an advanced beginner, the 160/1300 Dobsonian is a superb telescope with a great price-performance ratio.
However, the dedicated rework by telescope specialist Karl Kloss is also responsible for this.
Now it all has to be proven in practice. I'll report back.
Best regards, Friedrich Koob
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Hello Mr. Kloss
Addendum to the last report
Practice:
It took some time until the weather was good enough for an outdoor test. This allowed me to try out the device in dry conditions and optimize it a bit.
-The included 1.25 Super Plössl eyepieces (10, 25, 32) and the 1.8x (not 3x as I initially thought) Barlow lens are better than what is usually included with beginner's accessories. This was also confirmed terrestrially with my "old" refractor compared to the Meade eyepieces (4, 6, 12).
-My initial skepticism about the Barlow (light loss and chromatic aberration) was not confirmed, so I am well equipped for a start.
On both telescopes, they provide a significantly larger, bright, and sharp field of view right up to the edges.
The red dot finder is a bit difficult to adjust because the plastic lining of the adjustment screws doesn't hold. I padded it with some plastic – now it works – but I can't see the rings at dusk, so I also mounted a conventional 6x30 finder (almost new on eBay for ¤12). I'm very happy with the combination now.
On the very sturdy rocker box, I replaced one of the locking screws with a handle from an old angle grinder, which helps with setting the altitude and azimuth tracking. When you turn the tube itself, it vibrates a bit.
I closed the screw holes with white plastic plugs from the hardware store (¤1.80) and filled the gaps around the pivot pin with plastic rings made from old CD spindles to eliminate any play.
Another annoying thing is that the rollers run directly on the paint on the lower wooden disc and literally dig in. I'll glue a thin metal disc (an old lid from a tin bucket) in here, then it'll run more smoothly. If possible, I'll add a degree scale to the edge of the lid and a small bubble level for alignment and leveling.
If I then align it to the north, I can roughly adjust it.
-I got a set of four Meade filters quite cheaply on Amazon.
-On the computer, I use the free Stellarium and the Kosmos Sky Year 2011. You can find a lot of software and literature online.
-For books, I've read Rückl, Picture Atlas of Space, Rückl, Constellations, Corvus, Large Atlas of Stars, a rotating star map, and Roth, Handbook for Stargazers.
Observation:
For the past few days, Jupiter and Uranus have been clearly visible to the south from my conservatory. I know I should choose a better location, but for now, it's enough. Jupiter showed several bands, and Jupiter's moons were razor-sharp points up to 130x with the 10x eyepiece. I'm not sure if Uranus was the same. At 200x magnification, things disappeared too quickly for me, so I still need a lot of practice and a better location.
For me, the 40x to 100x magnifications are more important than the maximum 320x with the 4x, for which I need a location somewhere on a mountain anyway.
The Moon was too full for serious observation, but the progress towards a refractor is clear.
The same applies to the Orion Nebula.
I didn't notice any reflections, and whether I could improve them further with black velvet film is questionable.
In any case, the instrument is very well adjusted and meets my expectations.
Best regards, Friedrich Koob
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Kson Dobsonian 102mm Dear Mr. Karl Kloß, Thank you for the fast delivery of the KSON 102/640 Dobsonian. Everything arrived safely. A quick review: Everything was individually packaged, securely packaged, and English assembly instructions were included, which you really don't need. If you do need them, the informative illustrations in the instructions are very helpful. The tube is cleanly manufactured; the folded tube means it's not completely round at the bottom, which is irrelevant for use. The mirror cell is generously designed, with no shadows from the focuser. The secondary mirror is also top-quality; the adjustment screws on it and the primary mirror are truly practical, with no fiddly grub screws. The mount is well-made, and all the screw connections fit. The screws on the eyepiece mount were a bit long, but they were easy to adjust with two washers. Due to the mount's beautiful, even and thick paint finish, the eyepieces fit a little too tightly for me, something that can easily be adjusted if desired, and doesn't detract from the good overall impression in any way. The azimuth alignment is smooth and smooth thanks to the roller bearings, perhaps a little too much at very high magnifications, but in my opinion, that's not what the Newtonian is designed for. For the elevation adjustment, I covered the washer on both sides and the locking knob with velvet film to distribute the friction more evenly. However, the functionality is unimpaired even without this measure. The Red Dot Finder lives up to its name; it's quick to attach and adjust, better than any 5x25 finder tube, and you'd probably have to pay around ¤20 for it alone at the astronomy market. First light of the Dobsonian yesterday, fine, clean point-like star images after 30 minutes. ``` After a cooling-off period, observing the Orion Nebula and the Pleiades with a 32mm Plössel was simply fantastic. With the 12.5 and also in combination with a 2x Barlow lens and the magnifications achievable with it, intrafocal/extrafocal, uniform diffraction patterns on the star. The included eyepieces are of good quality; on the astronomy market and with the corresponding names on them, they would already cost half the price of the telescope. I haven't tried the 3x Barlow yet. So, in short, it's a great piece, easy and quick to set up. It will always be with me on the few days with good observing conditions at my location. I also think it's simply ideal for beginners, provided it's set up securely (on a stool, barrel, or similar). Best regards, Matthias
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Kson Dobsonian 80mm
Hello Karl!
As discussed, here's my experience with the small Dobsonian:
The small Kson Dobsonian (80/500) arrived (after one day of delivery), very well packaged, and safe and sound.
Assembling the mount took only a few minutes thanks to the excellent fit. The necessary tools are included!
The mount is made of very sturdy, white-painted plywood. The plate for the tube is additionally reinforced with a fin that houses a handle. The roller bearings in the azimuth can be easily adjusted using a handy knurled nut.
The Dobsonian was already properly pre-adjusted; it only took a few minor adjustments to the star to produce a good diffraction pattern!
The red dot finder is good and has two switchable brightness levels.
The two included eyepieces, a 25mm and a 10mm Plössl, are multi-coated and of good quality! Not those junky eyepieces you usually get at this price!
Included is a 3x plastic Barlow lens, but with an achromatic element.
The Barlow lens's imaging properties are good, but considering the 500mm focal length (f6.3), a 2x lens would have been sufficient here.
With a 4mm eyepiece (from my stash), the image was surprisingly sharp and high-contrast at 125x magnification.
It's certainly fun to explore the Milky Way with the 25mm eyepiece at 20x magnification; the image is sharp right to the edges! But it also performs quite well on planets!
All in all, a successful mini Dobsonian, with great features, for quick spotting in between, or when I'm too lazy to get my 10-inch telescope out of the basement and then have to wait another hour for it to cool down.
Best regards,
Frank
Hello Mr. Kloss!
After some time has passed, I recently had the opportunity to test the KSON. I have to say, this is my first reflector telescope. However, one thing you can probably judge even without any experience with reflectors is the packaging. And that was already good. Then the assembly: no problem. I just noticed that the images in the manual were more or less black on a black background, in short: barely legible. On the other hand, I didn't need the manual for assembly (I hope so!). One negative aspect was that the screws for the roller bearings had already developed a lot of surface rust.
Once fully assembled (certainly less than half an hour), you have a pleasing device in front of you that is easy to use and adjust. A first glance through the eyepiece during the day at a few nearby trees astonished me: this thing is really good! The image was, in my opinion, clear and high-contrast, and above all, amazingly sharp at the edges. And definitely better than I expected.
A few days later, I had the opportunity to test the KSON against the starry sky. The first thing that impressed me was the edge sharpness during general "star surfing." The device was easy to adjust and guide. A look at the Andromeda Nebula as a specific object was also completely satisfactory, which, given my viewing conditions (city, ground floor, and plenty of street lighting), meant that the nebula was immediately visible. With an 8x30 binocular in the same price range, you have to look twice with indirect vision. Overall, the "image aesthetics" were really good, and I was pleasantly surprised by what the small aperture offered in terms of sharpness and contrast.
So, I would recommend this device as an astroappetizer. It lets you see more than you think and less than you'd like. I think it's worth the money and, both optically and mechanically, absolutely useful for your first steps.
Always a clear view, and thanks again for the device.
Dear Mr. Kloß,
Positive: The red dot finder was aligned in an instant and now reliably shows the way.
Contrary: As soon as an eyepiece was in the holder, the height adjustment didn't hold. You really have to "clamp" the corresponding locking wheel; now the height adjustment works even with heavy eyepieces. The adjustment is a bit jerkier than with my Dobsonian, but after a short time, you get a feel for the force required to adjust it.
Positive: The focus is positioned such that the drawtube doesn't protrude into the tube when the image is sharp; unfortunately, this isn't the case with all tubes.
The two included eyepieces are quite decent and produce an image of the moon that has already impressed a few neighbors. The included Barlow lens is quite mediocre; with a short 2x Barlow lens from Seben, the image was significantly better at the same magnification, especially at the edge of the field of view.
I've tried various other eyepieces besides the ones included. With a 32mm Plössl, the tube is a bit overwhelmed; it's difficult to ignore the secondary mirror. It handles a 25mm wide-angle lens without complaint and produces a beautiful image with a quite pleasant field of view. The magnification could be increased to over 100x, and focusing and changing the eyepieces was successful without the object disappearing. In this respect, the Kson is clearly superior to any Tschiboscope or similar, making it much more suitable for beginners. The eyepiece storage holes are a bit small for current eyepieces; I'll sand them down with sandpaper in due time.
Conclusion: The Kson is a device that can be easily recommended to beginners. We will, of course, do the same at the Astronomy Day. It's more than enough for casual observers, and others will develop a preference for a larger Dobsonian over time.
For now, I thank you for everything and remain with best regards from astrophysics,
Gerhard Schmitt
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Hello Mr. Kloß,
Today I had the chance to try out the small Kson Dobson 80/500. The sky was perfectly clear, the moon wasn't yet visible. In the early evening, my daughter (5 years old) wanted to try out the new telescope. Regarding the observation location, I have to say it was more than suboptimal... in the middle of Reutlingen (not a small town), on the first floor and roughly at the level of the streetlights. With the red dot finder – quickly adjusted in daylight beforehand – we easily found our first objects: the Orion Nebula, then the Pleiades, and finally the Little Horseman in the Big Dipper. My daughter was thrilled, even though the Plösl eyepieces presented a bit of a challenge for her.
Later, the moon appeared, and star and nebula observation was over, because it was the evening with the largest and brightest moon of the year. But that too was fascinating, seeing the craters crystal clear, and my wife was thrilled too. I simply left the telescope in place and monitored the current situation with my Redshift software... until Saturn slowly seemed to come into view between the canyons of buildings. Unsure whether it would be outshone by the moon, I went back out onto the balcony and sighted in with the red dot finder. Looking through the eyepiece, I first saw an ellipse at the 25mm eyepiece... I switched to 10mm, and then: Saturn, in all its glory, perfect seeing and an amazing performance from a telescope that doesn't cost much more than a good meal at a restaurant with my family. Amazing! My wife is thrilled, as are the neighbors who called especially... a perfect start.
I'd like to say thank you, also for the advice and the countless emails we exchanged beforehand... it won't be the last telescope I've seen from you!
Andreas Hagemann
PS: Yesterday I saw Saturn in our observatory's 50cm reflector telescope... it wasn't that much better ;-)
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150mm f/12 (1800mm) Maksutov-Cassegrain
Here are some very nice drawings of Jupiter taken with our 6" Maksutov-Cassegrain:
Many thanks to Lambert Spix! http://www.sky-scout.de/
Click on the respective image for a larger view!
Today I had the chance to try out the small Kson Dobson 80/500. The sky was perfectly clear, the moon wasn't yet visible. In the early evening, my daughter (5 years old) wanted to try out the new telescope. Regarding the observation location, I have to say it was more than suboptimal... in the middle of Reutlingen (not a small town), on the first floor and roughly at the level of the streetlights. With the red dot finder – quickly adjusted in daylight beforehand – we easily found our first objects: the Orion Nebula, then the Pleiades, and finally the Little Horseman in the Big Dipper. My daughter was thrilled, even though the Plösl eyepieces presented a bit of a challenge for her.
Later, the moon appeared, and star and nebula observation was over, because it was the evening with the largest and brightest moon of the year. But that too was fascinating, seeing the craters crystal clear, and my wife was thrilled too. I simply left the telescope in place and monitored the current situation with my Redshift software... until Saturn slowly seemed to come into view between the canyons of buildings. Unsure whether it would be outshone by the moon, I went back out onto the balcony and sighted in with the red dot finder. Looking through the eyepiece, I first saw an ellipse at the 25mm eyepiece... I switched to 10mm, and then: Saturn, in all its glory, perfect seeing and an amazing performance from a telescope that doesn't cost much more than a good meal at a restaurant with my family. Amazing! My wife is thrilled, as are the neighbors who called especially... a perfect start.
I'd like to say thank you, also for the advice and the countless emails we exchanged beforehand... it won't be the last telescope I've seen from you!
Andreas Hagemann
PS: Yesterday I saw Saturn in our observatory's 50cm reflector telescope... it wasn't that much better ;-)
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150mm f/12 (1800mm) Maksutov-Cassegrain
Here are some very nice drawings of Jupiter taken with our 6" Maksutov-Cassegrain:
Many thanks to Lambert Spix! http://www.sky-scout.de/
Click on the respective image for a larger view!
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100mm f/10 (1000mm) Maksutov-Cassegrain Gamma MC 4" f/10
Hello Mr. Kloß,
Today I would like to share my experience report with you on the 102mm Rumak from Bosma. You adjusted the unit perfectly, and the diagonal mirror also improved after your intervention. At 33cm long, this unit is really handy, even though it feels quite solid when held in your hand. I can use the dovetail rail with the photo tripod connections for my alt-azimuth and equatorial mounts. Both should be quite stable, as you'll likely be moving beyond 100x magnification with this Maksutov. As an f/10 unit, it can also achieve slightly larger exit pupils and is also suitable for use in deep sky observation.
I also added a flexible dew shield to the unit, which I lined with velour to suppress reflections. I have.
But let's get down to business: In winter, I cool the device down for 45 minutes before starting observations. This is worthwhile, because sharpness and contrast increase enormously when the device is at a reasonable temperature. Mars is currently at opposition, and although not particularly large this time, I targeted it first. With 125x magnification, the northern polar cap was clearly visible, as were the dark areas. The sharpness and the subtle contrast differences on the Martian surface were impressive. It's a pity I don't have an eyepiece for higher magnification. The contrast on the moon was also very striking – I had never seen the lunar surface so richly shaded before – it wasn't just the craters that fascinated me here.
Since my greater interest lies in deep-sky observation, I naturally targeted a few objects here as well. Incidentally, I like to use a red dot finder. The trapezoid in Orion was clearly visible at 100x or 125x magnification, but what was almost more fascinating was the Nebula structure around the Trapezium at 125x magnification. Here, the nebula's structures were visible as fibers, and the dark areas were finely defined. A beautifully high-contrast image.
In addition to the well-known Eskimo Nebula (planetary nebula), I finally brought the M38/NGC1907 duo in the Charioteer into view. This view was fantastic. With a 19mm eyepiece (53x magnification, 1.2° real field of view), the large M38 with its rows of stars and the small, cloud-like NGC1907 next to it could be seen simultaneously. These two objects look very different, and against the pitch-black sky, I didn't feel the need to increase the magnification. With averted vision, individual stars in NGC1907 were already visible even at this magnification.
Overall, it's a very portable instrument with remarkable contrast and very high sharpness. This is where careful adjustment in the telescope workshop and good optics really pay off. The instrument should be well-suited to If the telescope is adjusted to the ambient temperature (like any closed-mirror system), this will result in a further noticeable boost in image sharpness. The focal length of 1000mm at a 102mm aperture still allows for good fields of view and exit pupils, so I can also use the telescope for my deep-sky observations.
Best regards and clear skies,
Stefan Deichsel
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UWA 82° Eyepiece
A report on the UWA 6.7mm and 11mm 82°
Hello Charly;
I observed again yesterday with your eyepieces (UWA 82°, 6.7mm, and 11mm). I'm not an eyepiece expert, but I hope I can give you some honest information:
Now for the results:
The positive aspects:
1) Optically and qualitatively excellent workmanship and packaging
2) Even on the moon, in very bright light, there are no color fringes on edges or craters / not even a hint of them (very nice)
3) Stars are pin-thin and sparkling, no stray light is visible; The inner blackening is very well executed
4) Very sharp image up to 4/5 of the field of view, with only a slight loss of sharpness at the very edge.
5) Fits very precisely into my 1 1/4" reducer on the telescope and doesn't wobble or catch when you want to remove them.
6) The weight is still reasonable at 82° for the 6.7mm and 11mm.
The less positive aspects:
1) The rotating support is very stiff in cold temperatures, and the eyepiece usually rotates with it (you have to tighten it very tightly); perhaps a bit too much grease.
2) When the support is turned out, the 82° angle is very difficult to see (especially difficult for eyeglass wearers).
3) The smooth shape makes it easier for the eyepieces to slip out of your hand in cold temperatures and makes it more difficult to rotate the support.
So, that's it for now. I'm really happy with both focal lengths.
I hope there's something useful for you, otherwise you can You still have questions about specific observation types or objects.
I'll try it out for you and report back.
Best regards and CLS
Manfred
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UWA 30mm 82° Eyepiece
A review of the UWA 30mm 82°
I'd like to preface this review by saying that although I've been pursuing astronomy as a hobby for over 10 years, I'm no expert in eyepiece testing and can only express my subjective opinion here.
When the UWA 82° eyepiece I ordered arrived last week, I naturally unpacked it right away, and when I finally got it in front of me, I was a bit apprehensive. The eyepiece was even larger than I imagined. The kitchen scales showed a little over 1300 grams. Visually, it made a sophisticated impression; everything was cleanly crafted. The eyepiece sleeve had a locking groove, and the lenses shimmered with a green coating. The eyepiece is missing the rubber caps for stray light suppression. This problem is solved in a different way. The field lens of the eyepiece is virtually submerged in the eyepiece by twisting the eyepiece body, and this can be done continuously, allowing anyone to determine the desired depth themselves. I found this very practical, as everyone is familiar with the problem of lost rubber cups.
After inspecting it externally, I wanted to give it a first test. I inserted it into my 250/4.8 Newtonian and pointed the optics at the Berlin TV tower in daylight. The red and white transmitting antenna provides a good comparison of the eyepiece's field of view. For comparison, I used my 30 mm Baader eudiascopic lens, which, of course, is no match for field size, but at most in terms of sharpness and transparency. In these cases, it is recognized as good to very good. A look through the two eyepieces showed me for the first time how small the Baader's field of view actually is compared to the UWA.
I found the viewing behavior of the UWA eyepiece to be pleasant, with a nice eye relief. The only disadvantage here was the size. When you approach the eyepiece, your nose touches the eyepiece. This requires you to turn your head slightly away from the optical axis of the eyepiece and compensate for this twist with your eyes. So, you're not looking completely straight. Once you get used to it, though, it shouldn't be a problem. I also found it pleasant that you could rest your head lightly on the eyepiece while observing, which resulted in a very relaxed posture. The lowered lens also eliminated the risk of your eyelashes getting grease on the eyepiece.
The focus position of the UWA was still slightly behind that of the Baader. Therefore, the telescope focuser should have some space at the back. Or you could use an extension tube, as I did.
That same evening, I also had time to compare the two eyepieces on my balcony observatory. M27 was quickly found in the Baader. It wasn't exactly stunning under the Berlin sky, but it was still clearly visible. The view through the UWA showed almost the same view. M27 was just as easy to see, but in a much larger field. My next object was the Ring Nebula in Lyra. Although it's very small, it's brighter and therefore easy to find even on the outskirts of Berlin. The Baader showed it as a tiny little smoke ring. Here, too, the only difference compared to the Baader was that M57 was in a much larger field in the UWA. The field of view extended beyond the two "foot stars" of Lyra, making for a beautiful view. The separation between the two stars in the sky is just over 2°, so I now knew roughly how many degrees the eyepiece was showing me in the sky. I could also see how sharply the stars were imaged across the entire field of view. I only noticed a slight coma in the outermost part of the field of view, similar to the coma of the Baader, but it was no longer noticeable as a distraction during observation. In my opinion, the image aesthetic was no longer impaired by comet-like star formations.
Finally, I panned to the moon, which was only three-quarters illuminated. Comparing the two eyepieces, the Baader scored slightly higher in terms of sharpness. The UWA didn't appear out of focus on the moon, but the Baader's image was a bit crisper. Towards the end of the evening, a few clouds slowly but surely rolled in. Then came the UWA's big moment. The moon was in the large field of view, and the clouds moved in front of it like a theater curtain. Simply beautiful. This further reinforced the already positive impression. I'll definitely be there for the HTT in September. Perhaps I can test it directly against the 31mm Nagler under a really dark sky. I'll also have a 2-inch UHC filter, so even more challenging nebulae will be within range of my 10-inch Newtonian.
Michael Barchmann
"NoName" ED127
Hello Mr. Kloss,
A friend of mine has a TEC 140, and last night we placed the TEC and the 127ed apo side by side and compared them. We were in the city, so the Orion Nebula was the same in both with OIII, as was the double star Rigel, although the companion was a bit brighter in the TEC (slightly wider aperture).
On the Moon, the images with the 127ed were almost identical to those of the TEC 140. The four craterlets in Plato were all clearly visible with a 3.5 mm Nagler. The grooves around Ramsden were also very beautiful. I took AVIs of Clavius with the camera (Canon Powershot) behind a 7 mm Nagler at 4x zoom, and edited both the same way in Registax and Photoshop. I'll send you the images for comparison; in both, you can see all the craters in Clavius listed in the Rukl atlas. You can tell me if you see a difference.
My friend was very impressed, especially when he mentioned the price difference!
I can safely say that the 127ed triplet offers value for money!
Sincerely,
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"NoName" ED102
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Hello Mr. Kloß,
Yesterday I was able to enjoy a wonderful first light with my ED 102. The first glimpse of low-lying Jupiter showed more details in the cloud bands than with the 90mm refractor, but the cooling time is also a bit longer, which I hadn't considered before.
Since the moons were all adjacent to Jupiter, I moved on to the double stars. First, I looked at Gamma Del (4m3/5m1 9.2") and Struwe 2725 (7m5/8m0 6.1"), which fit nicely together in the field of view of the TS 15mm SW eyepiece and were clearly visible at 47x magnification. The varying brightness of the double stars made for an interesting sight. Then I moved on to Epislon Lyre, where all four components were clearly visible in the Hyperion 5mm eyepiece. M57 was visible as a beautiful smoke ring. I checked the diffraction rings on Vega, and it looks very good; there are no signs of distortion, coma, or anything like that; adjusting the optics was worth it.
I then moved toward Rho Her (4m5/5m5 4.2"), which was already separated at 10mm with the zoom eyepiece. I also briefly passed M13, which showed individual stars resolved at the edge, but the rising moon was noticeable. M26 and M27 also looked less impressive. So, off to the moon. I then focused on it and observed the Jansen crater. Rimae Jansen was also very clearly visible. In the Hyperion 5mm eyepiece at 142x, it was a very beautiful sight with many details in the crater. The craters Fabricius and Mitrius, which were still half in shadow, were also very nice to observe. Even with the Hyperion 3.5mm at 204x, the image was very high-contrast and clear. I couldn't see any colors.
After about 3 hours of first light, I took down my telescope and went into the warmth of my house. I think I bought a decent telescope with good optics for the price. The OAZ runs smoothly and smoothly, and the 1:10 gear ratio works very well. Only the dew cap and the principle of having to mount it upside down for transport take some getting used to. Otherwise, with the large carrying case, it's a good set.
Best regards to Munich
Markus W.
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Hello Mr. Kloß,
Yesterday I was able to observe again, and when it came to the view of the moon, I can only say it was unique. I've never seen so many individual structures visible in the crater walls alone with any of my telescopes before. Even craters that aren't on the terminator are now worthwhile objects to observe. So, once again, I'd like to express my sincere gratitude for the excellent adjustment of the telescope; the effort was worth it.
Best regards
from Mülheim
Markus W.
Hello,
After finally managing to take a look through my 102mm f/7 (700mm) ED APO triplet refractor, I'm more than thrilled. It's perfectly calibrated and has a really good image. Observing with this device is truly a pleasure. I've been using the APO for visual solar observation so far and will soon be using it for photography as well. A trip to the moon was simply a delight; no color fringing was noticeable. Since I was immediately overconfident, I attached my unmodified Canon 450d and, without guiding, pointed it at the Orion Nebula near the edge of the Ruhr area. With an NEQ6 and just the APO attached, I then took 12 x 20-second exposures and ended up with this result: my first astrophotography.
I hope I can get more good shots with the APO and would like to thank you again for the advice.
Regards, Ralf Schmidt
Feedback geben
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Weitere Erfahrungsberichte unter "Teil 2"!
This Product was added to our catalogue on 12/04/2011.
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