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Celestron CGEM 925 Schmidt Cassegrain Computerized Telescope

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Product Description

Celestron CGEM 925 Schmidt Cassegrain Computerized Telescope


Celestron CGEM - 925 Computerized Telescope features our high-end 9.25" Schmidt Cassegrian OTA with XLT coatings mounted on our brand new CGEM™ mount. The Celestron CGEM™ mount has a fresh, attractive, bold appearance and is capable of carrying Celestron’s higher-end SCT optical tubes (up to 11") securely and vibration free which is ideal for both imaging and visual observing. Ergonomic Design - CGEM was designed to be ergonomically friendly with large Altitude and Azimuth adjustment knobs for quick and easy polar alignment adjustment. The internal RA and DEC motor wiring provides a clean look and an easy and trouble free set up. Innovation - The CGEM series has a new innovative Polar alignment procedure called All-Star™ (patent pending). All-Star allows users to choose any bright star, while the software calculates and assists with polar alignment. Another great feature of the CGEM, sure to please astroimagers, is the Permanent Periodic Error Correction (PEC) which will allow users to train out the worm gears periodic errors, while the mount retains the PEC recordings. Performance - For objects near the Meridian (imaginary line passing from North to South), the CGEM will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM mount has a robust database with over 40,000 objects, 400 user defined programmable objects and enhanced information on over 200 objects. Celestron's CGEM mount is the perfect fit between the Advanced Series and CGE Series. Offering the portability of the Advanced Series and the precision of the CGE. 


Celestron CGEM 925 Schmidt-Cassegrain Computerized Telescope Features: 

High Levels of Optic Clarity and Sharpness

Large 9.25" aperture offers outstanding light gathering capabilities

Premium Celestron StarBright XLT Optic Coatings

Easy and automated night sky viewing with computerized equatorial mount

Ultra Sturdy 2" steel tripod with Accessory Tray

Comfortable viewing position for objects high in the sky with star diagonal

6x30 finderscope accurately finds objects

Schmidt-Cassegrain mechanism that moves the primary mirror to adjust focus is supported by two pre-loaded ball bearings, minimizing the "mirror flop" typical of bushing focus mechanisms 


CGEM 925 Computerized Mount Features: 

40,000 object database with over 100 user-definable objects and expanded information on over 200 objects

Proven NexStar computer control technology

New "All-star" Polar alignment uses any bright star for a quick and accurate Polar alignment


Software Features include:

Mount Calibration, Database Filter Limits, Hibernate, five Alignment Procedures, and user-defined slew limits

Flash upgradeable hand control software and motor control units for downloading product updates over the Internet

Custom database lists of all the most famous deep

sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; variable star; solar systems; objects and asterisms

Permanent programmable periodic error correction (PEC) corrects for periodic tracking errors inherent to all worm drives

Drive Motors

Low Cog DC Servo motor with integrated optical encodes offer smooth, quiet operation and long life. The motor armatures are skewed to minimize cogging which is required for low speed tracking.

Internal Cable wiring for trouble-free setup and transportation

Designated six-pin RJ-12 modular jack, ST-4 compatible guide port

Autoguide port and auxiliary ports located on the electronic plate for long exposure astrophotography

Double line, 16-character Liquid Crystal Display Hand Control with backlit LED buttons for easy operation of goto features

RS-232 communication port on hand control to control the telescope via a personal computer

Includes NexRemote telescope control software, for advanced control of your telescope via computer

Precision machined 40mm diameter steel Polar shafts supported by multiple tapered roller bearings and ball bearings.

GPS compatible with optional CN16 GPS Accessory

Secure power plug ensures that the Mount's power source is not accidentally disconnected


Celestron CGEM 925 Schmidt Cassegrain Computerized Telescope



Optical Design

9.25" Schmidt-Cassegrain

Focal Ratio


Focal Length







Computerized Equatorial

Optical Coatings

StarBright XLT Coatings

Optical Tube


Eyepiece 1

25 mm (0.98 in)

Eyepiece Magnification

94 x

Eyepiece 1 Field of View


Star Diagonal



Adjustable, Stainless Steel


NexRemote Control Software with RS232 cable

Power Supply

Car Battery Adapter

Highest Useful Magnification

555 x

Lowest Useful Magnification

34 x

Limiting Stella Magnitude


Resolution (Rayleigh)

0.59 arcsec

Resolution (Dawes)

0.49 arcsec

Light Gathering Power

1127 x

Angular Field of View

0.53 °

Secondary Mirror Obstruction

3.35 in (85.09 mm)

Secondary Mirror Obstruction by Area

13.1 %

Secondary Mirror Obstruction by Diameter

36.2 %


Steel worm gear and 90mm pitch diameter brass worm wheel

Motor Drive

Low cog DC Servo motors with encoders, both axes

Computer Hand Control

Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons

Slew Speeds

Nine slew speeds: 5°/sec, 2°/sec, 1°/sec, 64x, 16x, 8x, 4x, 1x, .5x

Tracking Rates

Sidereal, Solar and Lunar

Tracking Modes

EQ North and EQ South

Alignment Procedures

2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar System Align

Software Percision

24 bit, 0.08 calculation


40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects

Power Requirements

12 VDC 3.2 Amps


Optional SkySync GPS Accessory


1 x 11 lbs , 1 x 17 lbs

Optical Tube Length


Telescope Weight




User Level

For Advanced

Telescope Type


Aperture Size


Focal Length


Focal Ratio


Highest Practical Magnification






Mount Type

Computerized Mount




2 Years Limited Warranty


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