Celestron CGEM 800 HD Computerized Telescope

Available now - The CGEM EdgeHD 8" telescope combines Celestron's newly designed CGEM Computerized Equatorial mount with its new EdgeHD optical system. With up to 11" of aperture, our premium StarBright XLT coatings and diffraction limited performance, CGEM EdgeHD Series are designed as premier astro-imaging telescopes. New Optical Design The EdgeHD optical system takes all of the compact power popularized by the SCT and combines it with an improved high definition optical system for wide field, astrograph quality images. As a visual instrument EdgeHD optics deliver pinpoint images even with your widest field eyepiece. You can search for all of the Messier Catalog objects and see NGC, IC and Caldwell objects with amazing clarity. For astroimaging, the EdgeHD optics produce aberration-free images across your favorite CCD or DSLR camera. All EdgeHD optics are designed to produce an extremely flat focal plane precise enough to match the strict tolerances of the largest commercial ccd detectors, pinpoint stars to the very edge of the chip.


Diffraction Limited
Some companies boast that their telescopes give diffraction limited stars in the very center of the field of view . EdgeHD optics not only produce diffraction limited stars on axis, but maintain diffraction limited stars across the entire field of view of many of the most popular astrophotography cameras. Even at the very edge of a full frame camera chip, the EdgeHD delivers diffraction limited stars of only 1 arc seconds.

The EdgeHD optics produce a focal plane more than 3 times flatter than the standard equivalent SCT telescope with diffraction limited stars across the entire Nikon D3 or Canon 5D field of view!

Along with the newly designed optics, the EdgeHD also has re-designed mechanics guaranteed to help you get the maximum performance from your instrument. Features include:

Mirror Locks – To hold the mirror in place and reduce image shift during imaging.

Tube Vents - Each vent has an integrated 60 micron micro-mesh filter allowing hot air to be released from behind the primary mirror.

Fastar Versatility – All EdgeHD optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging. Not only does imaging in the FASTAR configuration allow for exposure times that are 25 times faster than at f/10, but also yields a field of view five times wider. A perfect combination for imaging your favourite wide field objects in a fraction of the time. (FASTAR imaging requires a third party lens assembly in place of the secondary mirror).

The 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 allows 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, 100 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.

CGEM 800 HD - General Features
8" EdgeHD Optics
CGEM Computerized Equatorial Mount
Celestron's premium StarBright XLT coatings
9x50 finderscope to help accurately find objects
Ultra sturdy 2" steel tripod with Accessory Tray
Star diagonal provides more comfortable viewing position when observing objects that are high in the sky

CGEM 800 HD - HD Features
New aplanatic Schmidt telescope design produces aberration-free images across a wide field of view
Mirror tension locks hold the primary mirror in place and reduce image shift
Cooling vents allow hot air to be released from behind the primary mirror
Fastar compatible for fast f/2 imaging



CGEM 800 HD - Computerized Mount Features
Proven NexStar computer control technology
40,000 object database with over 100 user-definable objects and expanded information on over 200 objects
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
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 encoders 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 to control the telescope via a personal computer
Includes NexRemote telescope control software, for advanced control of your telescope via computer
Secure power plug ensures that the Mount's power source is not accidentally disconnected
GPS compatible with optional CN16 GPS Accessory
Precision machined 40mm diameter steel Polar shafts supported by multiple tapered roller bearings and ball bearings.

Specifications:
Optical Design : EdgeHD Optics
Aperture : 203.2 mm (8 in)
Focal Length : 2032 mm (80 in)
Focal Ratio : 10
Finderscope : 9x50
Mount : CGEM Computerized Equatorial
Optical Tube : Aluminum
Optical Coatings : Starbright XLT Coating
Eyepiece 1 : 40 mm (1.57 in)
Magnification 1 : 51 x
Star Diagonal : 1.25
Tripod : Adjustable, Stainless Steel
CD ROM : NexRemote control software with RS232 cable
Power Supply : Car battery adapter
Highest Useful Magnification : 480 x
Lowest Useful Magnification : 29 x
Limiting Stellar Magnitude : 14
Eyepiece 1 Field of View : 0.84 °
Light Gathering Power : 843 x
Secondary Mirror Obstruction : 2.7 in (68.58 mm)
Secondary Mirror Obstruction by Area : 11.4 %
Secondary Mirror Obstruction by Diameter : 33.8 %
Resolution (Rayleigh) : 0.69 arcsec
Resolution (Dawes) : 0.57 arcsec
Gear : 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 Precision : 24bit, 0.08 calculation
Database : 40,000+ objects, 100 user defined bjects. Enhanced information on over 200 objects
Power Requirements : 12 VDC 1.5 Amp
GPS : Optional CN16 Accessory
Counterweights : 1 x 17 lb
Optical Tube Length : 17 in (431.8 mm)
Telescope Weight : 88 lb (39.92 kg)

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