TS-Optics / GSO 8 "f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube

TS-Optics / GSO 8 f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube
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Shipping time: In stock + testing In stock + testing
Product no.: TSRC8M
MPN: TSRC8M
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Test und Justage GSRC8M GSO 8

Test and Adjustment GSRC8M GSO 8
This telescope is checked, measured and adjusted if necessary before delivery. The focuser is set.


How we adjust: About us


Please contact for advice on this telescope. So you can benefit from our experience before buying
 

TS-Optics / GSO 8 "f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube


8 "f / 8 RC Astrograph - 203mm aperture / 1624mm focal length
RC Telescope for Astrophotography and High-Level Observation (GSRC8M)


The main mirror of the GSO RC is made of quartz. This material does not change with changing temperatures. GSO also supplies to Orion-USA also simpler versions with BK7 mirrors. RCs with BK7 mirrors were tested at various optic testers and these were relatively rough. The quartz mirrors are much smoother. BK7 changes at different temperatures, even during the grinding process. For this reason, the production of the RC's with quartz primary mirror is more accurate and the optical quality probably a little better.

Caution - 2. Prism rail on the top is optional - included is one at the base

Until now, true RC telescopes were not only known for their good optical data, but above all for their high price. The well-known US manufacturer "Astro-Tech" then commissioned GSO, which is known for very good mirror optics, with the production of two genuine RC (Ritchey Chrétien) telescopes. The result is real astrographs, well above the level of typical Schmidt Cassegrains, at an affordable price. Teleskop-Service has taken over the Europe-wide distribution of these devices from GSO.

The 8 "f / 8 RC illuminates the complete 35mm format (24x36mm) and is of course suitable for full frame chips as well, but the optics are enough for small chips, but larger chips should be used with a field lens.

The image is completely free from color aberrations and the resolution is higher than that of most apochromatic refractors in this price level.

How do I get into focus with a DSLR?
The 8 "RC has a generous back focus that allows the use of extensive accessories If you want to shoot with a DSLR and want to have the focuser in a moderate position, you need:

- GSRCV50 ... 50mm spacer - comes between focuser and telescope
- TS FA 240 ... Adapter to T2 with 40mm extension.

If you want to use a 2 "diagonal mirror you will need the GSRCV50 before moving out.

The articles can be found in the section "recommended accessories".

The most important data:

Optical design: real RC system consisting of a hyperbolic main mirror and a hyperbolic secondary mirror.
Optical data: aperture 8 "(203mm), focal length 1624mm aperture ratio f / 8
Main mirror: made of quartz - surface quality 1/12 lambda or better - The main mirror is permanently installed in the tube. The main mirror is provided with a 99% reflection layer and dielectrically tempered. Of course, the main and secondary mirrors are adjustable.
Mirrors: made of quartz with 99% reflection - the secondary mirror is mounted in a robust cell that is adjustable. On request, we provide an adjustment aid (three points) for the adjustment with laser. The total shading by Fangspiegel and bracket are 85mm.
Tube: Metal Tube - Main and secondary mirror cells are made of metal. Weight of the tube is 7.5kg. The tube length is 580mm (including excerpt), the tube diameter is 230mm.
Computer-optimized inner panels: The inner tube is provided with inner panels, which prevent the ingress of stray light.
The focuser: The newly developed monorail excerpt 2 "is superior to conventional Crayford excerpts.
Mount Adaptation: At the base of the RC Telescope, there is a prism rail that has GP level, so the RC fits any Vixen mount and similar mounts.
The new monorail extract for the RC:

GSO monorail excerpt
The new 2 "extension is a significant advancement, compared to the old Crayford drawers.The monorail is mounted on a massive central stainless steel rail.This mounting is superior to the small and relatively soft ball bearings of the Crayford pull-outs.Always at high loads, the ball bearings give way slightly, while the massive guide rail of the monorail remains stiff.

The adjustment remains sensitive, even at high loads and by the 1:10 micro reduction is also a highly accurate focus, for example, in astrophotography, possible.

Another advantage is the optimized clamping via the generous thumbscrew on the top of the drawer. The clamping presses exactly centric on the axis, so there is no tilting of the pullout tube by uneven loading of the ball bearings and the stop is absolutely safe.

The advantages of the 2 "monorail in key words:
- better stiffness than typical Crayford extracts
- no susceptibility to tilting during clamping
- Adjustment of friction by knurled screw on the base
- Practical clamping with large knurled screw
- Brass ring clamp - 2 "clamping by two screws - no more tilting
- Practical 1:10 reduction for astrophotography

Technical specifications:

- RC system consisting of 2 mirrors
- Opening 203mm
- Focal length 1624mm
- aperture ratio f / 8
- Resolution on the axis 0.58 "
- Reflection on both mirrors 99% with the diel. protective layer
- Aufsteckdurchmesser (for example, for sun filters or Scheinerblenden) 230mm
- Weight: 7.5 kg
- Obstruction: 85 mm
- tube length: 580 mm incl. OAZ
Length of the prism rail: 395 mm (a prism rail at the base)
- Necessary extension sleeve for 2 "diagonal mirror: 50 mm
- "for 1.25" diagonal: 80 mm

Delivery:

- 8 "f / 8 RC Astrograph
- 2 "focuser with reduction to 1.25"
- Prism rail GP level
- M90 extensions



The original focuser is very good, it is better than comparable telescopes in this class and absolutely sufficient for astrophotography. The best focuser in this class comes from Starlight, it's the FTF2020BCR.

GSO RC8 monorail excerpt
Illustration shows the model with the carbon tube

The advantages of the GSO RC compared to systems with advanced corrector plate:
- pure reflection system with good field corrector (when using a DSLR no corrector is needed)
- also infrared photography is possible
- good photographic aperture ratio of f / 8
- no problems with dewing - that is a big problem of all systems with front corrector plate
- faster cooling because the RC is an open system
- brighter picture due to 99% mirroring of both mirrors
- Quartz mirrors (like Zerodur) - no problems with temperature adjustment
- no shifting problems when focusing - through the monorail extract (improvement to the Crayford)



The optical advantages of astrographs from GSO:

Optical Design - Ritchey Chrétien / RC
The GSO Astrograph is a true Ritchey-Chrétien reflector. In contrast to Maksutovs or Schmidt Cassegrains, which use spherical mirrors and corrector lenses, or Newton's, who need a coma corrector for astrophotography, the RC system is a pure reflection system with no color aberration, which works with two mirrors.

The RC system has a concave hyperbolic primary mirror and a convex hyperbolic secondary mirror.

The result is a comfree and large field of view, free of disturbing aberrations, which can be used for astrophotography but also for observation. The sharpness on the axis is higher and the usable field of view is larger than that of typical SC telescopes, Maksutovs or Newton's.

Because of these advantages, the Ritchey Chrétien system is mostly produced for astrophotography. This system is mostly used by professional large telescopes. Examples of RC systems are the 10 meter Keck telescope in Hawaii or the modern four 8.2 meter telescopes of the VLT in Chile. Now this system is also available to the amateur without NASA budget for a moderate price.


Mirror with 99% reflection and a dielectric protective layer
The main mirror of the 6 "RC telescope is made of homogenous BK7 material.The main mirror of the 8" RC is made of quartz material, which, like Zerodur, has no disturbing expansion value. The main and secondary mirrors are provided with a 99% reflection layer, which is protected against scratches and aging by a dielectric layer. The result is a much brighter picture than comparable devices.


Every optic is tested by the manufacturer
In order to maintain a consistently high level of quality, every look is corrected by hand after automatic production. Then an individual test is performed on a Zygo interferometer. Even at TS, before shipping, every look is checked again. This guarantees that you only get very good looks that will give you pleasure for many years to come.

_____________________________________________________________________________________________

The mechanical advantages of astrographs from GSO:

Fixed main mirror cell and computer-optimized inner panels
In contrast to conventional systems, where the main mirror is moved, the main mirror of the GSO RC telescopes is fixed. This prevents unwanted shifting and the optics are always optimally centered. Within the tube and the baffle tube, there are computer-optimized apertures, which further increase the contrast and prevent the ingress of stray light.


Adjustment of the system via the secondary mirror
Since the primary mirror is fixed in its optimized position, the adjustment can be achieved effectively and easily via the secondary mirror. The adjustment process is very simple and also from untrained hobby astronomers.
TS-Optics / GSO 8 f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube
TS-Optics / GSO 8 f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube
TS-Optics / GSO 8 f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube
TS-Optics / GSO 8 f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube
TS-Optics / GSO 8 f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube
TS-Optics / GSO 8 f / 8 Ritchey-Chrétien Telescope 203 / 1624mm Pro RC Metal Tube

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