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Celestron Advanced VX C8 EdgeHD 800 GoTo 8 "SC telescope on AVX mount

Celestron Advanced VX C8 EdgeHD Goto Telescope
The 800 HD combines the computer-controlled equatorial Advanced VX mount with the new Edge HD system. With a 20 cm opening and StarBright XLT coating, it collects over 800 times more light than the naked eye. Thanks to the good image sharpness, it is an excellent device for astrophotography. The tube weighs less than six kilograms, making the 800 HD the lightest and most portable device in its class.

New optical design
The EdgeHD optics (Edge High Definition) combine the compact design of a Schmidt-Cassegrain with a significantly improved image at the edge of the picture. This optical system not only offers the properties of astrographs, it also produces completely undistorted, sharp images up to the edge of the large visual and photographic field of view. Not only is the coma corrected outside the optical axis - as with other so-called "coma-free" optics designs available on the market (see also our test image) - but also the field curvature!

The difference
Many optical systems are propagated as "astrographs"; however, they produce the coveted "pinpoint" star image along a curved image plane. On recordings with modern CCD cameras, the result is a conspicuous field curvature that increases towards the edge of the field and becomes stronger the larger the chip; i.e. the stars remain round, but are inflated to the edge in small donuts.

With the CELESTRON Edge HD telescopes, in addition to the coma, this field curvature is corrected right up to the edge so that even recordings with large CCD chips are completely sharp, with a uniformly large star image over the entire chip - right down to the corners of the field of view.

This also significantly improves the resolution and limit size compared to competing optical systems with a similar opening. The Celestron XLT multi-coating also helps the Edge HD optics to significantly increase performance compared to similar systems on the market. Even on the edge of the field of a DX chip, the stars are less than 1.5 arcseconds in size.

Detailed information:

- 8 ”(200mm) f / 10 EdgeHD optics with StarBright XLT coating
- Flat image field and Hyperstar compatible
- Integer gear ratio and permanently programmable worm error correction avoid recurring tracking errors caused by the worm gear
- New motors offer better tracking and deliver more power to compensate for uneven load distribution
- New design for improved stability and rigidity
- No "meridian flip" - the new design means that the meridian passage does not have to be swung over so that the motor housing does not hit the mount.
- Autoguider connection for astrophotography
- Can be used on latitudes between 7 ° and 77 °
- Improved electronics with larger memory for future expansion
- NexStar + hand controller with five languages ​​(German, English, French, Italian, Spanish)

Technical specifications:

Optical design: Schmidt-Cassegrain
Opening: 203 mm (7.99 ")
Focal length: 2032 mm
Opening ratio: 10
Viewfinder: 9x50
Tube: aluminum
Mount: Advanced VX, equatorial
Eyepiece: 40 mm - magnification: 51 x
Shelf: yes
Tripod: 51 mm steel tube
Power supply: car charging cable
Highest sensible magnification: 480 x
Lowest sensible magnification: 29 x
Limit size: 14
Resolution (Rayleigh): 0.69 arcseconds
Resolution (Dawes): 0.57 arcseconds
Light collecting capacity: 841 x
Field of view: 0.84 °
Remuneration: StarBright XLT
Secondary mirror obstruction: 69 mm
Secondary mirror obstruction relative to the area: 11.4%
Secondary mirror obstruction relative to the diameter: 33.8%
Tube length: 43cm
Tube weight: 5.9kg
Mount weight: 7.7kg
Tripod weight: 8.2kg
Counterweight bar: 30 cm long, 1.9 cm (0.75 ") diameter
Counterweights: 1 x 5 kg
Total weight: 25 kg
Latitude range: 7-77 °
Motor: Low cog servo motors with encoders for both axes
Hand control box: NexStar +, two-line LCD display with 16 characters, 19 backlit LED buttons
Swivel speed: 9 swivel speeds, maximum 4 ° / sec
Tracking speeds: sidereal, solar and lunar
Tracking modes: EQ North & EQ South
Alignment procedure: 2-star alignment, quick alignment, 1-star alignment, last alignment, solar system alignment
Software precision: 24bit, 0.08 arcseconds calculation accuracy
Connections: 2x AUX port, autoguider port, RS-232 Com port on the hand control box
Database: over 40,000 objects, 100 user-definable objects, further information on 200 objects
Power requirement: 12V DC, 3.5A (tip positive)
Internal clock: yes
GPS: With optional SkySync GPS receiver