Celestron Advanced VX 9.25" EdgeHD SC telescope

New Optical Design
The Celestron EdgeHD 9.25" SC telescope combines the compact design of the Schmidt-Cassegrain telescope with a significantly improved image at the edge of the field of view. Not only does this optical system have the properties of astrographs, it also produces completely distortion-free, sharp images to the edge of the visual and photographic field of view. It corrects for coma not only off-axis - as other so-called "coma-free" optics on the market do - but also in the image plane!

The difference
Simultaneous optics are distributed as "astrographs"; however, the coveted "accurate" constellation is produced along a curved image plane. In images taken with modern CCD cameras, the result is a noticeable field curvature that increases towards the edge of the field, and the larger the CCD, the more significant the error. With Celestron Edge HD telescopes, this curvature is corrected beyond the coma to the edge of the field of view, so that even images taken with large CCD chips are perfectly sharp, evenly across the chip - right up to the corners of the image.


The new optical system improves resolution and performance compared to competing optical systems with similar apertures. The EdgeHD optics are also coated with Celestron XLT multilayer, so performance is significantly better than similar systems on the market.


The Celestron EdgeHD telescopes are Fastar-compatible, meaning that - like "conventional" SC tubes - the auxiliary mirror can be removed and, with the right adapter, a CCD camera can be fitted directly in place, in which case the instrument operates as an extra bright F2 system. Of course, common SC accessories can also be easily fitted to the tube. Filtered ventilation slots on the telescope tube help to speed up the heat dissipation. The annoying feature of catadioptric binoculars, image-shift, has been minimised by a more mechanically stable focus adjustment system. Special mention should also be made of the sturdy, practical handle on the tube.

The Celestron Advanced VX is a portable mechanism optimized for astrophotography, see the product page for more information.