telescopecomparison · 2-way
Celestron EdgeHD 11 vs Celestron C9.25 SCT
Celestron
EdgeHD 11
Best suited for experienced imagers chasing detail running a permanent observatory setup.
Celestron
C9.25 SCT
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Key differences
+19% focal length
+19% aperture
Specifications
| Specification | Celestron EdgeHD 11 | Celestron C9.25 SCT |
|---|---|---|
| Optics | ||
| Type | sct | sct |
| Optical design | Aplanatic SCT | Schmidt-Cassegrain |
| Aperture | 279mm | 235mm |
| Focal length | 2800mm | 2350mm |
| Native f/ratio | f/10.0 | f/10.0 |
| Image circle | 42mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 12.7kg | 9.5kg |
Advantages of Celestron EdgeHD 11
- Tighter framing — 2800mm vs 2350mm focal length
- 19% more light-gathering aperture
- Larger image circle (42mm) — supports bigger sensors
Advantages of Celestron C9.25 SCT
- Wider field — 2350mm vs 2800mm focal length
- Lighter (9.5kg vs 12.7kg) — easier to travel with
Best for — Celestron EdgeHD 11
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
Best for — Celestron C9.25 SCT
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
Celestron EdgeHD 11 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 0.74° × 0.49°Scale: 0.28"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.48° × 0.32°Scale: 0.28"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.23° × 0.23°Scale: 0.28"/px
Celestron C9.25 SCT — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 0.88° × 0.59°Scale: 0.33"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.57° × 0.38°Scale: 0.33"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.28° × 0.28°Scale: 0.33"/px
Celestron EdgeHD 11 — recommended user
Best suited for experienced imagers chasing detail running a permanent observatory setup.
Celestron C9.25 SCT — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.