CGEM II 800 EdgeHD

SKU: 12017

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  • Regular price $3,399.00

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  • 8” EdgeHD optics
  • CGEM II computerized equatorial mount
  • Celestron’s premium StarBright XLT coatings provide maximum light transmission
  • A 9x50 finderscope, 1.25” mirror diagonal for more comfortable viewing, and 1.25” 40 mm Plössl eyepiece are all included

CGEM II 800 HD combines Celestron's newly redesigned CGEM II computerized equatorial mount with its acclaimed EdgeHD optical system. With 8 inches of aperture and our premium StarBright XLT coatings, the CGEM II 800 HD gives you over 800 times the light gathering power than the unaided eye and is the lightest and most portable telescope in its class.

See the Universe in HD
EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma; it also provides an astrograph-quality flat focal plane all the way to the edge of the field of view.

True Astrograph Quality
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt-Cassegrain telescope and dramatically flatter than competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.

Mirror clutches - Flexible tension clutches hold the mirror in place and reduce image shift when taking long exposure astro-images. Once focused, the flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror assembly, keeping the image centered in the eyepiece (or on the sensor).

Fastar versatility - EdgeHD is the most versatile imaging telescope available today. At its native f/10, you can achieve the image scale necessary to capture the smallest of deep sky objects. Add the optional reducer lens—custom-designed for your size EdgeHD tube—and you can increase your field of view without sacrificing optical performance. A Barlow lens gives you added power for high-resolution planetary, lunar and solar imaging. All EdgeHD optical tubes are Fastar-compatible, allowing the secondary mirror to be removed and replaced with a third party lens accessory for ultra-fast f/2 wide field imaging.

Individually Tested
Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.

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.




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 Series and CGE Series. Offering the portability of the Advanced Series and the precision of the CGE.


    • 40 lbs payload capacity
    • Dual-fit Vixen/CG-5 and Losmandy/CGE dovetail saddle
    • 2" steel legs with height index marks for quick leveling
    • 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
    Alignment Procedures AutoAlign, 2-Star Align, Quick Align, 1-Star Align, Last Alignment, Solar System Align
    Aperture (mm) 203.2 mm (8 in)
    Computerized 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
    Dovetail Compatibility CGE Mount
    Dovetail Mount Directly connects to both CG-5 & CGE dovetail bars
    Finderscpoe 9x50
    Focal Length 2032 mm (80 in)
    Focal Length of Eyepiece 1 ... 40 mm (1.57 in)
    Focal Ratio 10
    Highest Useful Magnification 480 x
    Latitude Range 15" " 70"
    Light Gathering Power (Comp... 843 x
    Limiting Stellar Magnitude 14
    Lowest Useful Magnification 29 x
    Magnification of Eyepiece 1 51 x
    Motor Drive Low cog DC servo motors
    Mount Info: N.A.
    Mount Type German Equatorial Mount
    Mount Weight 40 lbs
    Optical Coatings StarBright XLT
    Optical Design EdgeHD
    Optical Tube Aluminum
    Optical Tube Info: N.A.
    Optical Tube Length 17 in (432 mm)
    Optical Tube Weight 14 lbs (6.35 kg)
    Payload Capacity 40 lbs
    Ports 1x Hand control port, 1x Auxiliary Port, 1x Auto guider port, 1 USB 2.0 port (on hand control)
    Power Requirements 12 VDC, 3.2 amps
    Resolution (Dawes) 0.57 arc seconds
    Resolution (Rayleigh) 0.69 arc seconds
    Secondary Mirror Obstructio... 11%
    Secondary Mirror Obstruction 2.7 in (69 mm)
    Slew Speeds 9 slew speeds
    Star Diagonal 1.25
    Total Weight of Mount Kit 77 lbs
    Tracking Modes EQ North and EQ South
    Tracking Rates Sidereal, Solar and Lunar
    Tripod 2" Steel tripod with graduated markings on lower section
    Tripod Weight 20 lbs
    Weight of Counterweight 1 x 17 lbs counterweight
    Barcode: 050234120173

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