Celestron CGEM-II 1100 EdgeHD f/10 Modified SCT Catadioptric Telescope

  • An 11-inch Astrograph.
  • EdgeHD Optics for 3x Flatter Edges.
  • All-Star Polar Alignment.
  • Dual Saddle Flexibility.
  • StarBright XLT Optical Coatings.
  • Mirror Clutches.
  • Internal Cable Wiring.



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Celestron CGEM-II 1100 EdgeHD f/10 Modified SCT Catadioptric Telescope

The CGEM-II 1100 EdgeHD Telescope by Celestron is a 279 mm (11-inch) Aperture corrected flat-field Schmidt-Cassegrain telescope with a CGEM II computerized German equatorial mount atop a sturdy tripod.  This 11-inch EdgeHD optical system gathers 40% more light than the 9.25-inch EdgeHD and 89% more than the 8-inch. At 28 lb, this OTA is still portable enough to take out to your favorite dark sky spot.

CGEM-II 1100 EdgeHD Features 

Ergonomic Design - The Celestron CGEM-II mount 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 provide a clean look and an easy and trouble-free set-up.

Innovation All-Star allows users to choose any bright star, while the software calculates and assists with polar alignment. Its Periodic Error Correction (PEC) allows users to train out the worm gears periodic errors, while the mount retains the PEC recordings. Furthermore, its dual saddle has the capacity to mount either CGE-Pro style Dovetails or CGE-5 Dovetails.

Performance - For objects near the Meridian (imaginary line passing from North to South), the Celestron CGEM mount 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, 400 user-defined programmable objects and enhanced information on over 200 objects.



  • Optical Design: EdgeHD.
  • Aperture: 279.4 mm (11 inches).
  • Focal Length: 2800 mm (110 inches).
  • Focal Ratio: f/10.
  • Focal Length of Eyepiece 1: 23 mm (0.91 inches).
  • Magnification of Eyepiece 1: 122x.
  • Finderscope: 9x50.
  • Star Diagonal: 2-inch w/ 1.25-inch Star Diagonal.
  • Optical Tube: Aluminum.
  • Highest Useful Magnification: 660x.
  • Lowest Useful Magnification: 40x.
  • Limiting Stellar Magnitude: 14.
  • Resolution (Rayleigh): 0.5 arc seconds.
  • Resolution (Dawes): 0.42 arc seconds.
  • Light Gathering Power (Compared to human eye): 1593x.
  • Secondary Mirror Obstruction: 95 mm (3.75 inches).
  • Secondary Mirror Obstruction by Diameter: 34%.
  • Secondary Mirror Obstruction by Area: 12%.
  • Optical Coatings: StarBright XLT.
  • Optical Tube Length: 610 mm (24 inches).
  • Optical Tube Weight: 28 lb (13 kg).
  • Dovetail: CGE Dovetail Bar.



  • Mount Type: Computerized Equatorial.
  • Instrument load capacity: 40 lb (18 kg).
  • Height adjustment range (includes mount and tripod): 1346 - 1651 mm (53 – 65 inches).
  • Tripod Leg Diameter: 50.8 mm (2 inches) Steel tripod with graduated markings on the lower section.
  • Latitude adjustment range: 15° - 70°.
  • Total EQ Head Weight: 41 lb (18.6 kg).
  • Accessory Tray: Yes.
  • Tripod Weight: 20 lb (9 kg).
  • Weight of Counterweights: 1 x 17 lb.
  • Slew Speeds: 9 slew speeds.
  • Tracking Rates: Sidereal, Solar and Lunar.
  • Tracking Modes: EQ North & EQ South.
  • Dovetail Compatibility: Dual saddle plates (Vixen and CGE saddle)
  • Number of Auxiliary ports: 2 (1x Hand control port and 1x AUX Port for optional accessories).
  • Autoguide port: Yes.
  • USB Port: Yes.
  • Power Requirements: 12 VDC, 3.2 amps.
  • Motor Drive: Low cog DC servo motors.
  • Alignment Procedures: AutoAlign, 2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar System Align.
  • Periodic Error Correction: Yes.
  • Computer Hand Control: Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons, USB 2.0 port for PC connection.
  • Database: 40,000+ objects, 100 user-defined programmable objects Enhanced information on over 200 objects.
  • Software: Starry Night Special Edition.




Included Technology

All-Star Polar Alignment

Get ready for a night of astroimaging with your mount faster than previously thought possible with All-Star Polar Alignment. This innovative software solves the time-consuming problem of trying to pinpoint the North Celestial Pole.

EdgeHD Optics

Celestron’s aplanatic EdgeHD optics revolutionized astroimaging. This award-winning optical system reduces visual defects like field curvature and coma, creating an ultra-flat field for pinpoint stars all the way to the edge of today’s largest imaging sensors.

Compatible Technology


The new Lithium Phosphate (LiFePO4) battery chemistry has significant advantages over other battery chemistries, great for those Astronomers on the go.

Starsense Technology

Celestron’s patented StarSense Technology makes it easier than ever to locate objects in the night sky, even if you’ve never used a telescope before. Turn it on and push ‘Align.’ In about three minutes, you’re ready to observe!


WiFi technology encircles the globe in a web of connectivity, knowledge, and information. Now, Celestron is using that same technology to allow stargazers to connect to the night sky and enhance their experience of the cosmos in fun and unique ways.


Aperture279.4 mm (11")
Camera/Eyepiece Connection2" Nosepiece
Camera/Eyepiece Connection2"x24tpi
Camera/Eyepiece Connection3.29"x16tpi
Database40000 Objects
Dawes Limit0.42 arcseconds
Drive TypeLow cog DC servo motors
Focal Length2800 mm
Focal Ratiof/10
Free ShippingYes
Head DesignGerman Equatorial
Hightest Magnification558.8x
Instrument Capacity40 lbs
Limiting Magnitude16
Mount Head Weight40lbs
Optical DesignModified SCT
PortsAuto guider port
PortsAuxiliary Port
PortsHand control port
PortsUSB 2.0 port
Power Consumption12v2A
Secondary Obstruction95mm
Telescope ConnectionDual Vixen & Losmandy
Total Weight20lbs
Total Weight77lbs
Tube Diameter280mm
Tube Length610mm
Tube Weight28 lbs
Warranty2 Year Warranty


  • Celestron's 1100 EdgeHD 279 mm (11-inch) corrected Schmidt-Cassegrain OTA.
  • CGEM-II Mount: Equatorial/ Large Alt-Azimuth Alignment Knobs/ All-Star polar alignment and PEC/ Dual Saddle.
  • Tripod: Adjustable 2-inch Steel Legs with Graduated markings
  • Hand Controller: NexStar+.
  • (2) Counterweights, 17 lb each.
  • Accessory Tray/ Spreader.
  • Finder: 9 x 50 Optical.
  • 2-inch Eyepiece: 23 mm (0.91 inches), 122x mag./Luminos.
  • 2-inch Star Diagonal includes an 1.25-inch adapter.
  • Power Adapter/ DC Cigarette Lighter adapter.
  • CD ROM: NexRemote.
  • 2 Year Warranty.