Celestron CGEM-II 800 EdgeHD Telescope - CE-12017

Brand: Celestron

SKU : CE-12017

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  • Rounder, more pleasing stars with improved resolution and limiting magnitude.
  • A 203 mm (8-inch) EdgeHD Corrected Schmidt-Cassegrain Telescope.
  • Produces Aberration-Free Images.
  • Focal Ratio of f/10.
  • Fastar Compatible Down to f/2.
  • Internal Cable Wiring.
  • Smooth and Quite Operation.

Product Details

  • The Celestron CGEM-II 800 EdgeHD Telescope is capable of carrying Celestron's higher-end SCT optical tubes (up to 11-inches) securely and vibration free which is ideal for both imaging and visual observing.

    Superior mount performance combined with superior edge performance not only creates rounder, more pleasing stars but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. When it comes to the Celestron HD series coupled with Celestron's StarBright XLT coating group on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum. It's a vision you'll never forget.

    Features of the Celestron CGEM-II 800 Telescope

    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.


    The Celestron CGEM-II 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-II, sure to please astro-imagers, 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. Furthermore, the new mount model is equipped with a dual saddle capable of mounting both predominant kinds of Dovetail.


    For objects near the Meridian (imaginary line passing from North to South), the Celestron CGEM-II mount will track well past the Meridian for uninterrupted imaging through the 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.

     800 EdgeHD FEATURES

    • A 203 mm (8-inch) EdgeHD Corrected Schmidt-Cassegrain Telescope
    • EdgeHD aplanatic, flat field SCT optics for pinpoint stars to the edge of the largest imaging sensors and widest eyepieces.
    • Aluminum optical tube with tube vents featuring an integrated 95-micron mesh filter allows hot air to be released from behind the primary mirror.
    • Mirror support knobs hold the mirror in place and reduce image shift during imaging.
    • Versatile design accommodates 3 focal ratios: native f/10, f/7 with the addition of a focal reducer, or ultra-fast f/2 imaging with a removable secondary mirror and third-party accessories.


    • 2-inch steel legs with height index marks for quick leveling.
    • 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 setting 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.


  • specifications

    Aperture203 mm (8")
    Back Focus133.35mm
    Camera/Eyepiece Connection2”x24 tpi
    Corrected Image Circle42mm
    Dawes Limit0.57 arcseconds
    Dew Shield Size226mm
    Drive TypeLow cog DC servo motors
    Focal Length2032 mm
    Focal Ratiof/10
    Free ShippingYes
    Head DesignEquatorial
    Highest Magnification406x
    Instrument Capacity40 lbs
    Latitude Range15 to 70 Degrees
    Light Gathering Power841x
    Limiting Magnitude15.3
    Mount Head Weight40lbs
    Optical DesignModified SCT
    PortsAutoguide Port
    PortsHand Controller
    PortsUSB 2.0
    Power Consumption12V DC 3.2A
    Secondary Obstruction68.6mm
    Slew Speed5 Degrees Per Second
    Telescope ConnectionDual Vixen & Losmandy
    Total Weight77 lbs
    Tracking RatesLunar
    Tracking RatesSidereal
    Tracking RatesSolar
    Tripod Weight20 lbs
    Tube Diameter226mm
    Tube Length432mm
    Tube Weight14 lbs
    Warranty2 Year Warranty
  • included items

    • Celestron's CGEM-II 800 EdgeHD, 203 mm (8-inch) Aperture Corrected Schmidt-Cassegrain OTA.
    • Celestron CGEM-II (Computerized German Equatorial Mount).
    • Adjustable Tripod with 2-inch Steel legs.
    • Hand Controller.
    • Accessory Tray/ spreader.
    • 1.25-inch Star Diagonal.
    • 9 x 50 Optical Finder.
    • 1.25-inch Eyepiece, 40 mm Plossl (51x magnification). 
    • DC Cigarette Lighter Adapter.
    • (1) Counterweight, 17-pound.
    • CD ROM Software: NexRemote.
    • 2 Year Manufacturer's Warranty.

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