This telescope is checked, measured and adjusted if necessary before delivery. The focuser is set. Upon request, you will receive a meaningful quality certificate from your telescope (test report with star test, Ronchi, adjustment, with individual serial number) included! Please specify with order!

Examples of our test protocols: test recordings
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Celestron CGEM 925 - 235 / 2350mm C9 GoTo telescope and mount

C9 1/4 - Schmidt Cassegrain - 235mm / 2350mm - on Goto Mount Celestron CGEM

(CGEM - 925 Computerized Telescope - 11098)

The C-9,25 is more than just an intermediate between the C-8 and the C-11.

The device offers a higher contrast and better field sharpness than comparable Schmidt Cassegrains. This makes the C-9,25 particularly interesting for the observation of the moon and planets. Celestron has designed the C-9,25 extra for star friends, who on the one hand do not want to do without opening, but on the other hand want to have sharpness and contrast close to a Maksutov.

This is the result of a complete recalculation of the optics. The C-9 is about as long as the C-11. Nevertheless, the aperture ratio is 1:10. Main and secondary mirrors do not have such an extreme aperture ratio and thus somewhat weaker radii than in other Schmidt Cassegrains. With the same manufacturing accuracy, the quality of the image in focus becomes better. Of course, every C-9,25 is hand-rubbed.

The CGEM carries the C9.25 with excellent stability and provides enough reserves even for heavy accessories. The combination is highly recommended for observation and photography.



Ready for FastStar

- The C9 is the latest version - already prepared for FastStar. With the HyperStar conversion kit you turn the C8 into a powerful F / 2 CCD Schmidt camera for astrophotography.



Information about the Celestron CGEM - parallactic mount with computer control - up to 20kg instrument weight


... massive GoTo mount for devices up to 11 "aperture - well suited for astrophotography.

Celestron CGEM Parallactic Mount GoTo

The CGEM mount from Celestron offers, in addition to an attractive design, also good inner values. The mount closes the gap between the proven Advanced GoTo mount (CAM) and the massive CGE. The CGEM can be loaded with equipment, up to about 20kg dead weight, depending on the application and lever.

Built-in tracking with automatic object positioning ... The CGEM comes with a complete GoTo control with approximately 40,000 stored objects and a clean working tracking.

Especially massive pole height ... Large knurled screws in azimuth and height allow easy adjustment of the mount, even at full load. The pole height is particularly solid and gives the mount a higher stability.

Innovative arrangement for astrophotography ... The CGEM has a particularly effective one-nosing procedure (All Star - patent pending). For a precise arrangement it is sufficient, after the calibration of the computer, simply to approach a bright star. The software then calculates the deviation from the optimal arrangement and then tells how far the mount in the azimuth and in the pole height still needs to be corrected. A Polsucher is no longer necessary.

Permanent electronic correction of the screw error ... Also very important for astrophotography - the permanent correction of the periodic error. The mount remembers the correction. The tracking becomes more accurate. Thus, the mount is particularly well suited for astrophotography.

The mount goes beyond the meridian ... Especially handy when taking long-exposure astro-shots and the object passes the meridian. The exposure can be continued. The mechanics of the mount allows a tracking far beyond the meridian passage, without swinging.

Sturdy 3 "prism clamp ... The CGEM already has the same massive 3" prism clamp as the Celestron CGE or Losmandy mounts. The 3 "clamp allows the use of sturdy, large prism rails, resulting in less vibration and more rigidity in the overall system.

Solid stainless steel tripod ... The height-adjustable stainless steel tripod is extendable to 140cm height. The stability is fully maintained. The wide adjustment range always brings the mount to the correct working height, depending on the instrument type.



The computer control:

- Database of over 40,000 objects - 400 user-defined objects - over 200 objects with extended information
- proven NexStar technology
- Firmware updatable over the internet
- New innovative All-star Polar Alignment - perfect placement in minutes
- Five alignment possibilities - from the simple 1-star calibration to the highly accurate calibration with any number of stars
- Permanent programmable error correction of the periodic error of the RA screw
- Worm wheel (90mm diameter) made of brass - screw made of steel
- Servo motors with quiet operating noise
- Internal cables - only one connection to the controller
- Autoguiderport - ST4 compatible / RS 232 port
- Includes NexRemote software - for controlling the mount via the computer
- GPS compatible


Technical data of the optics:

- Opening: 235mm
- Focal length: 2350mm
- Opening ratio: f / 10
- Schmidt Cassegrain optics with XLT coating
- Max. reasonable magnification: approx. 500x
- Limit size visually: 14m5
- Resolution: 0.52 "
- Shading by the secondary mirror: 34%
- Length of the tube: 58cm
- Diameter of the tub: 265mm
- Weight about 9,4kg



The mount and the scope of delivery:

- Parallactic mount with instruments up to 20kg loadable
- Mount weight: 18.6kg
- Tripod weight: 7,7kg
- 9 adjustment speeds (5 ° / sec, 2 ° / sec, 1 ° / sec, 64x, 16x, 8x, 4x, 1x, 0.5x)
- Tracking speeds - Siderial, Solar and Lunar
- Changeover north / south
- Power supply - 12V / 1.5 amp - cigarettes lighter cable included
- Counterweight with 8.2 kg is included in the basic equipment
- Permanent correction of the tracking error (NexRemote software)
- RS232 cable