Details
CELESTRON - 9.25" EdgeHD™ Optical Tube Assembly (OTA) • 91040-XLT
The Celestron EdgeHD 925 is a catadioptric based optical tube assembly with the EdgeHD optical system to reduce coma. This makes it outstanding for both visual astronomy and astrophotography and is capable of imaging a wide variety of celestial objects ranging from planets to distant galaxy clusters. With the addition of the StarBright XLT™ coatings by Celestron, excellent and efficient light transmission is realized. Since most Schmidt-Cassegrain designs normally have a default focal ratio of f/10 but can be reduced by using the Fastar™ system of removable secondary mirrors to create a blazing- fast focal ratio of f/2 for wide field and fast astrophotography with most deep sky objects. This is a step up from the regular Schmidt-Cassegrain design!
- Catadioptric system
- EdgeHD optical system to reduce coma on edges of field of view
- 2500mm focal length
- 9.25" aperture
- StarBright XLT Coatings
- 9x50 Finderscope
- 23mm Luminos Eyepiece - 2"
- 2" Star Diagonal
- 1.25" Visual Back
- Dovetail slide bar for mounting the CGE mount
- Fastar compatible to transform f/10 to f/2
mw/mc0615
Product Series
SEE THE UNIVERSE IN HD Introducing Celestron's New Aplanatic Schmidt Telescope Design! visibly Sharper images Superior performance. Enhanced Mechanical features fastar Compatible
EdgeHD is an aplanatic Schmidt telescope designed to produce 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, but also to give an astrograph quality flat focal plane all the way to the edge of the field of view.
Additional Information
| Name | Celestron - EdgeHD 925 9.25" Optical Tube Assembly (OTA) |
|---|---|
| Manufacturer | Celestron |
| Model | CEL-91040-XLT |
| Manufacturer Part No | CEL-91040-XLT |
| Aperture | 234.95 mm (9.25 in) |
| Dovetail Compatibility | CGE Mount |
| Eyepiece 1 | 23 mm (0.91 in) |
| Eyepiece 1 Magnification | 102 x |
| Eyepiece Focal Length | 23 mm (0.91 in) |
| Finderscope | 9x50 |
| Focal Length | 2350 mm (92.52 in) |
| Focal Ratio | 10 |
| Highest Useful Magnification | 555 x |
| Light Gathering Power | 1127 x |
| Lowest Useful Magnification | 34 x |
| Optical Coatings | StarBright XLT |
| Optical Design | EdgeHD |
| Optical Tube | Aluminum |
| Optical Tube Length | 22 in (558.8 mm) |
| Optical Tube Weight | 21 lbs (9.53 kg) |
| Resolution (Dawes) | 0.49 arc seconds |
| Resolution (Rayleigh) | 0.59 arc seconds |
| Secondary Mirror Obstruction | 3.35 in (85.09 mm) |
| Secondary Mirror Obstruction by Area | 13.1 % |
| Secondary Mirror Obstruction by Diameter | 36.2 % |
| Star Diagonal | 2" w/ 1.25" adapter |
