Celestron · Schmidt-Cassegrain
Celestron EdgeHD 925 OTA
Celestron's 9.25-inch workhorse: flat-field optics that satisfy both visual observers and astrophotographers
Price updated Mar 22, 2026
Performance Scores
Overview
The Celestron EdgeHD 925 OTA is a serious instrument aimed at observers and imagers who have outgrown entry-level equipment and want a telescope that can genuinely do both jobs well. The 234.95mm aperture and 2350mm focal length at f/10 give you meaningful light-gathering power and enough resolution to split tight double stars, resolve globular clusters, and pull detail from planetary surfaces. What separates the EdgeHD from a standard SCT is the corrected flat focal plane. Traditional Schmidt-Cassegrains produce a curved focal plane that causes stars near the edges of an image to blur and distort.
The EdgeHD corrects this across a wide field, which matters enormously if you are imaging with a DSLR or a large chip camera. Visually, the improvement is also noticeable when using wide-field eyepieces. The included 23mm Axiom eyepiece gets you started at 102x, a practical magnification for many targets. At 15.42kg, this OTA requires a sturdy equatorial mount, sold separately, so budget accordingly.
GoTo and tracking are mount-dependent, not built into this tube assembly. StarBright XLT coatings improve light transmission across all optical surfaces, which contributes to contrast and faint-object visibility.
At a Glance
234.95mm
Aperture
f/10
Focal Ratio
15.42kg
Weight
2350mm
Focal Length
Specifications
Key Features
- 234.95mm aperture resolves fine planetary detail and separates tight double stars comfortably
- Flat-field EdgeHD optical design eliminates edge-of-field star bloat, benefiting both visual use and wide-field imaging
- StarBright XLT coatings on every optical surface improve contrast and transmission compared to standard SCT coatings
- Flexible mirror tension clutches reduce mirror shift during focusing, a common frustration with traditional SCT designs
- Cooling vents behind the primary mirror shorten thermal equilibration time, reducing image blur during the first hour of use
- Astrograph-quality performance means this OTA pairs well with large-chip cameras without requiring an additional field flattener
- At 15.42kg, a heavy-duty equatorial mount is essential and represents a significant additional investment to plan for
Customer Reviews
4 reviews
Great telescope
I already had 5" scope but like many wanted more ! This ota has flatter fov & can't wait to use the fastar/hyper star ! I have No regrets except I waited so long