The Celestron Edge HD 800 is an aplanatic flat field Schmidt-Cassegrain which provides aberration-free images across a wide field of view. A true astrograph, the EdgeHD 800 provides a 28mm image circle, making it suitable for APS-C sensors.
Celestron's EdgeHD series combines the strengths of Schmidt-Cassegrains with imaging performance of modern Corrected Dall-Kirkham designs, all in an affordable package. The classic SCT is well corrected on-axis but suffers from coma and field curvature, making them unsuitable for deep sky imaging. By adding a two-element corrector lens and optimizing the overall optical design, the EdgeHD solves these problems while keeping costs low for a corrected instrument. The EdgeHD series includes Celestron's StarBright XLT optical coatings on each surface, giving maximum light transmission across the visual and photographic spectrum between 400 - 750nm.
In addition to the optimized optical design, the EdgeHD includes flexible tension mirror clutches which reduce image shift over long exposures. This allows the mirror to be held securely in place without putting additional force or pressure on the mirror assembly. Filtered cooling vents on the rear cell let hot air to be expelled from behind the primary mirror.
The EdgeHD is an incredibly versatile instrument, with a 0.7x reducer available separately and Fastar/Hyperstar compatibility for super-fast imaging at f/2.
Every EdgeHD is tested in-house by Celestron to ensure its high optical performance and the surface quality of each optical surface.
Specifications
| Optical design | Aplanatic Schmidt-Cassegrain |
|---|---|
| Aperture | 203.2 mm (8") |
| Focal length | 2032 mm |
| Focal ratio | f/10 |
| Resolving power | 0.57 arc seconds |
| Image circle | 28 mm |
| Light gathering power | 843 times the human eye |
| Central obstruction diameter | 64 mm (31% of aperture diameter) |
| Wavelength range | 400 - 750 nm |
| Optical coatings | StarBright XLT |
| Backfocus from rear flange | 133.35 mm (105 mm with optional reducer) |
| Mount attachment | CGE dovetail plate |
| Threads | 2"-24 UNC |
| Tube length | 432 mm |
| Tube weight | 6.35 kg |
| Tube diameter | 238 mm |
| SKU | CE-91030-XLT |
Items included
- EdgeHD 800
- CGE dovetail
- 9 x 50 finderscope
- 1.25" mirror diagonal
- 40mm Plossl 1.25" eyepiece
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.
