The CGEM II 800 HD pairs Celestron's newly revamped CGEM II computerized equatorial mount with the renowned EdgeHD optical system, featuring an 8-inch aperture and premium StarBright XLT coatings. This telescope provides over 800 times the light gathering power of the naked eye and stands as the lightest and most portable telescope in its class.

Optical Tube Information:

Experience the Universe in High Definition EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope designed to produce aberration-free images across a broad visual and photographic field of view. This optical system goes beyond addressing off-axis star coma; it delivers an astrograph-quality flat focal plane extending to the edge of the field of view.

True Astrograph Quality Many optical designs claiming to be "astrographs" only deliver pinpoint stars over a curved focal plane. While this might suffice for some visual observation, it results in out-of-focus stars at the edge when used with the flat chip sensor of a digital camera. EdgeHD optics provide a focal plane more than three times flatter than standard Schmidt-Cassegrain telescopes and significantly flatter than competing coma-free designs. This ensures sharp stars across some of the largest CCD chips available today. Find out more about EdgeHD technology.

Enhanced Performance Superior edge performance not only yields rounder, more aesthetically pleasing stars but also enhances resolution and limiting magnitude compared to telescopes of similar aperture. With Celestron's StarBright XLT optical coatings on all surfaces, EdgeHD optics offer maximum light transmission across the widest visual and photographic spectrum.

Mechanical Features Apart from EdgeHD's optimized optical design, the telescope tube has been redesigned to optimize its performance every night.

Mirror clutches - Flexible tension clutches securely hold the mirror in place, reducing image shift during long exposure astro-images. Once focused, flexible rods allow the mirror to stay in position without exerting force or pressure on the mirror assembly, keeping the image centered in the eyepiece (or on the sensor).

Tube vents - Cooling vents located on the rear cell allow hot air to escape from behind the primary mirror. Each vent incorporates an integrated 50-mesh filter, ensuring the release of warm air while preventing dust from entering.

Fastar versatility - EdgeHD stands as the most versatile imaging telescope currently available. At its native f/10, you can achieve the necessary image scale for capturing the smallest deep sky objects. Incorporating the optional reducer lens, custom-designed for your specific EdgeHD tube size, allows you to expand your field of view without compromising optical performance. A Barlow lens offers added power for high-resolution planetary, lunar, and solar imaging. All EdgeHD optical tubes support Fastar compatibility, enabling the removal of the secondary mirror and its replacement with a third-party lens accessory for ultra-fast f/2 wide field imaging.

Individually Tested Every EdgeHD undergoes rigorous testing for surface quality on each optical component. Furthermore, it is tested with a camera and artificial star to ensure the imaging system meets stringent quality standards. This "final acceptance test" guarantees the EdgeHD's field performance and its ability to deliver high-quality astroimages.

Mount Information:

A Fresh Take on the Reliable CGEM Mount The CGEM II is an updated version of the dependable CGEM mount, featuring a fresh, bold appearance. It offers secure and vibration-free support for Celestron's higher-end SCT optical tubes, accommodating models with apertures of up to 11". This feature makes it ideal for both imaging and visual observation. With a payload capacity of 40 lbs. and a slew rate of 5° per second, you can effortlessly point to any celestial object in the extensive database.

Ergonomic Design

The CGEM II was designed with user comfort in mind, featuring large Altitude and Azimuth adjustment knobs for quick and easy polar alignment adjustments. The internal RA and DEC motor wiring ensures a clean and uncluttered appearance, simplifying setup and reducing potential issues.

Innovation

The CGEM II series introduces Celestron's innovative Polar alignment procedure called All-Star™. All-Star allows users to select any bright star while the software calculates and assists with polar alignment. Another notable feature of the CGEM II is the Permanent Periodic Error Correction (PEC), allowing users to calibrate the worm gears' periodic errors while retaining the PEC recordings.

Performance

For objects near the Meridian (the imaginary line from North to South), the CGEM II provides excellent tracking well beyond the Meridian, allowing uninterrupted imaging during the most favorable part of the night sky. The CGEM II mount boasts a comprehensive database with over 40,000 objects, supports 100 user-defined programmable objects, and provides enhanced information on more than 200 objects. Celestron's CGEM II mount strikes a balance between the portability of the Advanced Series and the precision of the CGE Series, making it an ideal choice for astrophotography and visual astronomy alike.

Specifications

OPTICAL TUBE INFO:
Optical Design:	EdgeHD
Aperture:	203.2mm (8")
Focal Length:	2032mm (80")
Focal Ratio:	f/10
Focal Length of Eyepiece 1:	40mm (1.57")
Magnification of Eyepiece 1:	51x
Finderscope:	9x50
Star Diagonal:	1.25" Star Diagonal
Optical Tube:	Aluminum
Highest Useful Magnification:	480x
Lowest Useful Magnification:	29x
Limiting Stellar Magnitude:	14
Resolution (Rayleigh):	0.69 arc seconds
Resolution (Dawes):	0.57 arc seconds
Light Gathering Power (Compared to human eye):	843x
Secondary Mirror Obstruction:	64mm (2.5")
Secondary Mirror Obstruction by Diameter:	31%
Secondary Mirror Obstruction by Area:	9.77%
Optical Coatings:	StarBright XLT
Optical Tube Length:	432mm (17")
Optical Tube Diameter:	238mm (9.37")
Optical Tube Weight:	14 lbs (6.35 kg)
Dovetail:	CGE Dovetail Bar
MOUNT INFO:
Mount Type:	Computerized Equatorial
Instrument load capacity:	40 lbs (18 kg)
Height adjustment range (includes mount and tripod):	1346mm - 1651mm (53" – 65")
Tripod Leg Diameter:	50.8mm (2") Steel tripod with graduated markings on lower section
Latitude adjustment range:	15° - 70°
Mount Head Weight:	40 lbs (18.14 kg)
Accessory Tray:	Yes
Tripod Weight:	20 lbs (9 kg)
Weight of Counterweights:	1 x 17 lbs
Slew Speeds:	9 slew speeds - max speed 4.5°/second
Tracking Rates:	Sidereal, Solar and Lunar
Tracking Modes:	EQ North and EQ South
GPS:	N/A
Dovetail Compatibility:	Dual saddle plates (CG-5 and CGE saddle)
Number of Auxiliary Ports:	2 AUX Ports (1x Hand control Port and 1x AUX Port for optional accessories)
Autoguide Port:	Yes
USB Port:	Yes, input on Hand Control
Power Requirements:	12V DC, 3.2 amps
Motor Drive:	DC servo motors
Alignment Procedures:	2-Star Align, 1-Star Align, Solar System Align, Last Alignment, Quick Align
Periodic Error Correction:	Yes
Computerized Hand Control:	2 line x 18 character backlit Liquid Crystal Display, 19 LED backlit buttons, USB 2.0 Port for PC connection
NexStar+ Database:	40,000+ objects, 100 user defined programmable objects Enhanced information on over 200 objects
Software:	Celestron Starry Night Special Edition Software and SkyPortal App
Total Kit Weight:	92 lbs (41.7 kg)
Included Items:	CGEM II Equatorial Head Tripod Accessory Tray 1 x 17 lbs counterweight NexStar+ Hand Control DC Power Cable (item#18769) Hand Control Holster
Solar Warning	Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result. Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it. Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.
California Residents	WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

Software and Documentation

MANUALS:
CGEM II EQ Mount Manual
EdgeHD Optics Manual
Whitepaper EdgeHD Optics
NexStar Plus Hand Control Manual
SOFTWARE & FIRMWARE:
CPWI Software
Celestron Firmware Manager (CFM) Software
NexRemote Telescope Control Software
Periodic Error Correction Tool (PECTool)
OTHER PRODUCT FILES:
SCT & EdgeHD Collimation Guide
How to Align a Red Dot Finder to Your Telescope Video
Solar Safety Warning
What are the Sizes of Collimation Screws
Celestron NexStar+ Hand Control Troubleshooting Guide

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Celestron CGEM II 800 EdgeHD

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