The Celestron CGX 800 HD telescope package combines Celestron’s state of the art CGX computerised equatorial mount with the acclaimed EdgeHD optical system. With the telescope’s 8 inches of aperture and with the premium StarBright XLT coatings, the CGX 800 HD gives you over 800 times the light gathering power than the unaided eye and is the lightest and most portable telescope in the range.
The EdgeHD telescope 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.
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. The superior edge performance of the EdgeHD not only creates rounder, more pleasing stars, but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. With Celestron’s StarBright XLT optical coatings on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.
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.
In addition to EdgeHD’s optimised optical design, the telescope tube has been redesigned to make sure you get the most from your optics each and every night and has the following mechanical features.
- 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).
- Tube vents – Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 95-micron micromesh filter guaranteed to let warm air out without letting dust in.
- 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 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.
The Celestron CGX Equatorial mount has been designed from the ground up to provide a solid and accurate platform for your telescope for both visual and astro-imaging requirements. The mount has a number of new and innovative features including a lower profile EQ head, which provides a more compact and stable mount; a better drive system; home and limit optical sensors with internal hard stops making it more remote operation-friendly; internal cable management.
In addition Celestron have made mechanical and ergonomic improvements too. These include conveniently located mount carrying handles to make transport and mounting (and removing) the mount on/off the tripod easier. There are also large latitude and dovetail clamp adjustment knobs to make the CGX easier to set up with your telescope.
The mount can be controlled with software developed in conjunction with PlaneWave Instruments – called CPWI – and is supplied free with the mount. CPWI uses advance PointXP mount modelling that allows you to add 100+ points to an alignment model for the mount set up, for the most accurate pointing and tracking possible for your Celestron telescope. The software also features an All-Star Polar Alignment routine, motor focus control and plate solving.
|OPTICAL TUBE INFO:|
|Focal Length||2032mm (80″)|
|Focal Length of Eyepiece 1||25mm (.98″)|
|Magnification of Eyepiece 1||81x|
|Star Diagonal||1.25″ Star Diagonal|
|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||12.5 lbs (5.67 kg)|
|Dovetail||CGE Dovetail Bar|
|Mount Type||Computerised Equatorial|
|Instrument load capacity||55 lbs (25 kg)|
|Height adjustment range (includes mount and tripod)||1200.15mm – 1968.5mm (47.25″ – 77.5″)|
|Tripod Leg Diameter||50.8mm (2″) Steel tripod with graduated markings on lower section|
|Latitude adjustment range||3° – 65°|
|Mount Head Weight||44 lbs (20 kg)|
|Tripod Weight||19.2 lbs (8.7 kg)|
|Weight of Counterweights||2 x 11 lbs|
|Slew Speeds||9 slew speeds – max speed 4°/second|
|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 Aux ports (Hand Control can use either Aux port)|
|USB Port||Yes, input for Mount and Hand Control|
|Power Requirements||12V DC, 4 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|
|Computerised 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||PWI Telescope Control Software, Celestron’s Starry Night Special Edition Software, SkyPortal App|
|Total Kit Weight||99.2 lbs (45 kg)|
|Included Items||CGX Equatorial Head | CGX Tripod | Accessory Tray | 2 x 11 lbs counterweights | NexStar+ Hand Control | 8mm Allen Wrench | 12V DC Power Cable | Hand Control Holster|