Celestron CGEM II 9.25" (925) SCT Telescope

Celestron CGEM II 9.25'' (925) SCT Telescope
Celestron CGEM II 9.25'' (925) SCT TelescopeCelestron CGEM II 9.25'' (925) SCT TelescopeCelestron CGEM II 9.25'' (925) SCT Telescope
Celestron CGEM II 9.25'' (925) SCT TelescopeCelestron CGEM II 9.25'' (925) SCT Telescope


Incoming - Shipped 1-2 working days.

Model:  cel_cgem_ii_925_sct_12011
Part Number:  12011
Brand:  Celestron


Celestron 2 Year Warranty

Celestron products include a two year warranty except binoculars and spotting scopes which have limited lifetime warranties.


  • Telescope OTA
  • 6x30 Finderscope
  • 1.25" Star Diagonal
  • 25mm Eyepiece
  • CGEM II Equatorial Head
  • CGEM II Tripod
  • Accessory Tray
  • Counterweight bar with locking nut
  • Counterweight
  • Azimuth adjustment screws (x2)
  • Hand Control
  • Hand control holder (2 pieces)
  • DC Power Cable (Cigar Plug)

New Celestron CGEM II 9.25" SCT

The CGEM II 925 Schmidt-Cassegrain Telescope features Celestron’s premium StarBright XLT coated optics and the newly redesigned CGEM II computerised equatorial mount.  The CGEM II 925 offers the middle ground for those looking to combine portability with high resolution. This telescope is especially at home as a solid platform for long exposure photography with optional CCD cameras or photographic equipment.  With over 925 inches of aperture and our premium StarBright XLT coatings, the CGEM II 925 gives you over 1000 times the light gathering power than the unaided eye.

A fresh update to the venerable CGEM mount, the CGEM II 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. Capable of holding 40 lbs. of payload and slewing at 5° per second, you will be able to instantly point to any of the celestial objects in the database.

Ergonomic Design

CGEM II 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.


The CGEM II series features Celestron’s innovative All-Star Polar alignment procedure.  All-Star allows you to accurately polar align the mount using any star, even if the celestial pole cannot be seen. Another great feature of the CGEM II 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.


For objects near the Meridian (imaginary line passing from North to South), the CGEM II will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM II mount has a robust database with over 40,000 objects, 100 user defined programmable objects and enhanced information on over 200 objects. Celestron's CGEM II mount is the perfect fit between the Advanced VX Series and CGX Series.


  • 9.25" Schmidt-Cassegrain Optical Tube Assembly
  • Celestron's premium StarBright XLT coatings
  • 2350 mm focal length (f/10)
  • 25 mm eyepiece included (94x)
  • Visual back allows for use with 1.25" accessories
  • 6x30 finderscope to help accurately center alignment objects
  • Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • Includes large CGE style dovetail mounting bar


  • 40 lbs payload capacity
  • Dual-fit Vixen/CG-5 and Losmandy/CGE dovetail saddle
  • 2" steel legs with height index marks for quick levelling
  • USB 2.0 port on hand control for direct links to a PC via ASCOM supported software
  • 40,000 object database with over 100 user-definable objects and expanded information on over 200 objects
  • Internal cabling throughout for worry-free remote operation
  • Low cog DC Servo motor with integrated optical encoders offer smooth, quiet operation
  • Able to track past the meridian allowing seamless imaging
  • Permanent periodic error corrections allow users to train out the worm gears periodic errors once, while the mount retains the PEC recordings
  • Software Features include: Mount Calibration, Database Filter Limits, Hibernate, five Alignment Procedures, and user-defined slew limits
  • Built-in polar alignment program to polar align on any star in the sky
  • Longer clutch levers to make tightening and loosening of clutches easier
  • Custom database lists of all the most famous deep-sky objects by name and catalog number
  • Solar System alignment method allows to view the moon and planets during the day
  • Permanent Programmable Periodic Error Correction (PEC) corrects periodic tracking errors inherent to all worm drives
  • Custom Rate 9 feature allows to set maximum slew rate
  • Tandem mode allows to star align the mount even when positioned for tandem scope use
  • RS-232 communication port on hand control to control the telescope via a personal computer
  • Includes NexRemote telescope control software, for advanced control of telescope via computer
  • Precision machined 40 mm diameter steel Polar shafts supported by multiple tapered roller bearings and ball bearings
  • GPS-compatible with optional SkySync GPS Accessory


Product Specifications

Optical DesignSchmidt-Cassegrain
Aperture (mm)234.95 mm (9.25 in)
Focal Length2350 mm (93 in)
Focal Ratio10
Focal Length of Eyepiece 1 (mm)25 mm (0.98 in)
Magnification of Eyepiece 194 x
Star Diagonal1.25
Optical TubeAluminum
Highest Useful Magnification555 x
Lowest Useful Magnification34 x
Limiting Stellar Magnitude14.4
Resolution (Rayleigh)0.59 arc seconds
Resolution (Dawes)0.49 arc seconds
Light Gathering Power (Compared to human eye)1127 x
Secondary Mirror Obstruction3.35 in (85 mm)
Secondary Mirror Obstruction by Diameter36%
Secondary Mirror Obstruction by Area13%
Optical CoatingsStarBright XLT
Optical Tube Length22 in (559 mm)
Optical Tube Weight20 lbs. (9.07 kg)
Dovetail CompatibilityCGE Mount
MountGerman Equatorial
Tripod2” Steel tripod with graduated markings on lower section
Dovetail MountDirectly connects to both CG-5 & CGE dovetail bars
Payload Capacity40 lbs
Latitude adjustment range15º – 70º
Power Requirements12 VDC, 3.2 amps
Ports1x Hand control port, 1x Auxiliary Port, 1x Auto guider port, 1 USB 2.0 port (on hand control)
Motor DriveLow cog DC servo motors
Slew Speeds9 slew speeds
Tracking RatesSidereal, Solar and Lunar
Tracking ModesEQ North and EQ South
Alignment ProceduresAutoAlign, 2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar System Align
Computerised Hand ControlDouble line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons, USB 2.0 port for PC connection
Database40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects
Mount Weight40lbs
Tripod Weight20lbs
Weight of Counterweight17lbs
Total Weight77lbs

The following manuals and downloads are available for this product:


Celestron CGEM II Mount Manual (PDF)

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December 2017 / View Older
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