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Celestron CGX-L 925 EdgeHD GoTo C9.25 HD telescope on a very stable CGX-L mount

The telescope

The EdgeHD optics (Edge High Definition) combine the compact design of a Schmidt-Cassegrain with a significantly improved image at the edge of the picture. This optical system not only offers the properties of astrographs, it also produces completely undistorted, sharp images up to the edge of the large visual and photographic field of view. Not only is the coma corrected outside the optical axis - as with other so-called "coma-free" optical designs available on the market (see also our test image) - but also the field curvature!

The difference
Many optical systems are propagated as "astrographs"; however, they produce the coveted "pinpoint" star image along a curved image plane. On recordings with modern CCD cameras, the result is a conspicuous field curvature that increases towards the edge of the field and becomes stronger the larger the chip; i.e. the stars remain round, but are inflated to the edge in small donuts.

With the CELESTRON Edge HD telescopes, in addition to the coma, this field curvature is corrected right up to the edge, so that even recordings with large CCD chips are completely sharp, with a uniformly large star image over the entire chip - right down to the corners of the field of view.

This also significantly improves the resolution and limit size compared to competing optical systems with a similar opening. The Celestron XLT multi-coating also helps the Edge HD optics to significantly increase performance compared to similar systems on the market.

In addition to the new look, the mechanics and tube have also been completely redesigned. Innovations include:

Mirror locks hold the main mirror in any focus position without exerting pressure on the optical elements. The image always remains stable on the chip, even with long exposure times.
Ventilation openings behind the main mirror ensure rapid air exchange, so that the optics cool down quickly without competition. Thanks to an air filter system, no dust gets into the tube.
HyperStar compatible - With all EdgeHD tubes, you can remove the secondary mirror and replace it with the optional HyperStar optics. The result: your standard Celestron EdgeHD telescope becomes a digital Schmidt design for your CCD or DSLR camera for photography in primary focus at f / 2 (C8, C11) and f / 1.9 (C14).
You can find out more about this system on the special EdgeHD website.
Adapted telecompressors (f / 7.5) and Barlow lenses (f / 20) are in development.
Axiom eyepieces - The Edge HD 9.25 is delivered with an Axiom eyepiece from Celestron. With a 23mm focal length and 82 ° field of view, you get an impressive combination of magnification and field of view.

With HyperStar you can turn every Schmidt-Cassegrain with Fastar preparation into a digital Schmidt camera with approx. F / 2. You can find sample pictures here.

The mount

The CGX-L mount is the big brother of the CGX and carries devices weighing up to around 34 kilograms - this is also enough for the largest Celestron telescopes and accessories. With its own weight of less than 24 kg for the mount and 21 kg for the tripod, it is still easy to transport. Thanks to the large handles, it is even easier to transport than a comparable, somewhat lighter classic equatorial mount!

The CGX-L was developed for small observatories and remote operation, with the focus on a good ratio of payload to dead weight, a compact design and innovative details for your use of large telescopes, photo equipment and the latest wireless accessories.

A key role is played by the generously dimensioned worm wheels with 144 mm, which enable a smoother run even with heavy telescopes, as well as the dovetail clamp extended to 270 mm, which also holds large telescopes securely. For remote operation, there are optical sensors for the home and limit positions, simplified settings for north placement and improved cable routing. There are also mechanical and ergonomic improvements that make the mount even more stable, user-friendly and portable.

With the dual dovetail clamp for CG-5 (Vixen, Celestron) or CGE (3-inch Losmandy) you can easily e.g. switch between small solar telescopes and large Schmidt-Cassegrains. So that this is also fun in photography, the mount has been given powerful, responsive motors that are connected to the axles by a sturdy toothed belt. The mount reacts to control commands almost immediately, even from an autoguider. The gear backlash is eliminated, and since the worm wheels are also spring-loaded, the backlash is largely eliminated - you don't have to do so even with larger temperature differences Adjust, worms and gears have optimal contact.

The large screws are handy so that you can loosen or tighten them even with gloves - the pole height adjustment has also been revised so that you can easily adjust the mount even when fully loaded. A polar finder will be available as an option, but is usually unnecessary: ​​With the All-Star-Polaralign you can position the mount on any brighter star through the telescope, and for perfection, the shine is always superior to the polar finder. As a special feature, you can move the mount on the base plate of the extra-wide tripod head - so you can lay the center of gravity perfectly over the tripod, for the entire usable latitude range from 3 to 65 ° north or south latitude. The flat base can also be easily adapted to your own columns - you can find a drawing for an adapter here.

As a photo mount, it is just as suitable for mobile use as for remote operation. Internal sensors ("switches") automatically move the mount into the home position and prevent it from driving too far when panning and knocking anywhere. The internal wiring also serves for security: All connections (power, hand controller, AUX and autoguider) are in the base of the mount and do not move.

The hand controller can be controlled in the classic way via ASCOM and the hand controller (with USB connection) via PC, or you can use the control software included as a download, which was developed together with Planewave Instruments. Multipoint GoTo modeling, plate solving and focusing control are just a few of the functions that you normally have to upgrade for remote operation - this software is included with the CGX. You do not need the hand controller here, but can use the mount's USB connection directly.

DETAILED INFORMATION

The telescope

- 9.25 "EdgeHD optics
- Aluminum tube
- StarBright XLT compensation
- 2350mm focal length (f / 10)
- 23mm Axiom 2 "eyepiece (102x)
- 9x50 viewfinder
- 2 "diagonal for convenient observation of objects close to zenith
- New optics design for point-like star imaging over a large image field
- Mirror locks hold the primary mirror in place to protect against mirror shifting
- Ventilation openings enable rapid temperature adjustment of the main mirror
- Fastar compatible for photography with f / 2

The mount

Increased payload of 34 kilograms, excellent ratio of payload to dead weight
Additional AUX sockets and autoguider connection on the dec axis for better cable management

144mm worm wheels to better and more accurately track heavy loads

270mm long dovetail clamp to better support large telescopes
Steel tripod with 70 mm legs and a larger spreading angle for a more stable stand
New accessory tray for three 1.25 "eyepieces, two 2" eyepieces and an upright holder for tablet or smartphone
Heavy duty counterweight rod made of stainless steel with a diameter of 31.5mm for additional counterweights
Optionally available polar finder specially for CGX and CGX-L as an alternative to the software-supported All-Star Polar Align

Supports wireless and wired control with accessories such as StarSense AutoAlign and SkyPortal WiFi module (sold separately)
Characteristics of the mount

Compact, low-profile mounting head for more stability and better portability. More stable and stiffer with a shorter decay time.
Improved motors with more torque, for better swiveling and tracking even with a large payload
Heavy-duty toothed belts minimize gear play and enable short reaction times even with heavy loads
Viewing windows in the motor housings show the activity of the drives

Spring-loaded worm wheels made of measurement and stainless steel reduce the friction and increase the accuracy of fit
Internal wiring, power and lower connection sockets do not move when the mount swivels
Home and limit switches - internal hardware stops for R.A. and Dek to avoid tangled cables and collisions with the tripod

Internal optical sensors on both axes for simple and safe remote operation
Home sensors enable the mount to always move to the start position, regardless of the position it was in before the power supply was interrupted
Limit sensors automatically interrupt tracking or panning before the mechanical stops are reached
Includes the sophisticated PWI control software (available as a download) developed in collaboration with Planewave Instruments. Mastered multi-point go-to modeling, focusing and plate solving. No other tax software is required, which saves you hundreds of euros!

Software-supported northing: "All-Star Polar Alignment" enables fast and very precise northing. Use any he ll stars, without additional accessories or apps.
The position of the mount head on the tripod can be adjusted in order to optimally place the center of gravity above the tripod and to make optimal use of the large latitude range of 3-65 °
dual dovetail mount for CG-5 / EQ / Vixen and CGE / 3 "Losmandy

Follows up to 20º on both sides via the meridian, supports SkyPortal WiFi and StarSense AutoAlign modules.
Tripod legs can be folded without first removing the accessory tray.
Revised tripod with larger spreading angle for more stability. The minimum height of the tripod has been lowered at popular request

Improved ergonomics

Two handles for easier transport and assembly

Handy clamps for dovetail clamping
Innovative and improved system for northing

Revised adjustment mechanism for the pole height, even with a fully loaded mount. A stationary adjustment button for the pole height with a newly developed connection system reduces the friction when the mount is nested. A revised azimuth setting with low-friction Teflon bearings makes it easier to position a fully loaded mount.
Easily readable latitude scale

electronics

- NexStar + hand controller with USB connection
- USB 2.0 socket for direct connection to a PC with the PWI software (as download)
- 2 autoguider connections for optimal cable management
- PEC sensor, PPEC Ready - for automatic correction of the periodic screw error
- 12V power connection
- Internal real time clock

TECHNICAL SPECIFICATIONS

The mount

MOUNTING TYPE: Parallactic, computer controlled
PAYLOAD: 34 kg (75 lb)
MOUNTING HEAD WEIGHT: 21.3 kg (without counterweight rod)
WEIGHT OF THE MOUNTING HEAD: 23.9 kg
TRIPOD WEIGHT: 21 kg
TRIPOD HEIGHT: 91 to 134 cm
TRIPOD LEG DIAMETER: 7 cm (2.75 ")
POLE HEIGHT ADJUSTMENT RANGE: 3º-65º
MAXIMUM SWIVEL SPEED: 4 ° / second (3 ° / second by default)
TRACKING SPEED: Sidereal, Sun, Moon
AUX CONNECTIONS: 4 (for hand controllers and accessories)

The telescope:

OPTICAL DESIGN: EdgeHD Optics
OPENING: 235 mm (9.25 inches)
Focal length: 2350 mm
OPENING RATIO: 10
VIEWFINDER: 9x50
TUBE: aluminum
COMPENSATION: Starbright XLT
Ocular 1: 23 mm
MAGNIFICATION 1: 102 x
ZENITSPIEGEL / PRISMA: 2 "with 1.25" adapter
HIGHEST SENSIBLE MAGNIFICATION: 555 x
LOWEST SENSIBLE MAGNIFICATION: 34 x
LIMIT SIZE: 14.4
RESOLUTION (RAYLEIGH): 0.59 arcseconds
RESOLUTION (DAWES): 0.49 arcseconds
FACE FIELD WITH STANDARDOCULAR: 0.53 °
LIGHT COLLECTION: 1127 x
FACE FIELD: 0.8 °
LEAF MIRROR OBSTRUCTION: 85 mm
LEAF MIRROR OBSTRUCTION RELATIVE TO AREA: 13.1%
COLLAR MIRROR OBSTRUCTION RELATIVE TO DIAMETER: 36.2%
TUBE LENGTH: 559 mm
WEIGHT: 9.5 kg