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Celestron Advanced VX C925 EdgeHD Goto telescope on AVX mount

Celestron Advanced VX C925 EdgeHD Goto Telescope
The 925 HD combines the new computer-controlled equatorial AVX mount with the Edge HD system. With an opening of over 23 cm and the StarBright XLT coating, it collects more than 1000 times more light than the naked eye. Thanks to the good image sharpness, it is an excellent device for astrophotography.

EdgeHD Optics

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" optical 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 into small rings ("donuts") towards the edge.

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:

- 9.25 "EdgeHD optics
- Aluminum tube
- StarBright XLT compensation
- 2350mm focal length (f / 10)
23mm Axiom 2 "eyepiece (102x)
- 9x50 viewfinder
- 2 "diagonal for convenient observation of objects close to zenith
- New optics design for point-like star imaging over a large image field
- Mirror locks hold the primary mirror in place to protect against mirror shifting
- Ventilation openings enable rapid temperature adjustment of the main mirror
- Fastar compatible for photography with f / 2
- Integer gear ratio and permanently programmable worm error correction prevent recurring tracking errors from the worm gear
- New motors offer better tracking and provide 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)