telescopecomparison · 2-way
Celestron C9.25 SCT vs Celestron EdgeHD 8
Celestron
C9.25 SCT
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Celestron
EdgeHD 8
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Key differences
+16% focal length
+16% aperture
Specifications
| Specification | Celestron C9.25 SCT | Celestron EdgeHD 8 |
|---|---|---|
| Optics | ||
| Type | sct | SCT |
| Optical design | Schmidt-Cassegrain | Aplanatic SCT |
| Aperture | 235mm | 203mm |
| Focal length | 2350mm | 2032mm |
| Native f/ratio | f/10.0 | f/10.0 |
| Image circle | — | 42mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 9.5kg | 6.4kg |
Advantages of Celestron C9.25 SCT
- Tighter framing — 2350mm vs 2032mm focal length
- 16% more light-gathering aperture
Advantages of Celestron EdgeHD 8
- Wider field — 2032mm vs 2350mm focal length
- Larger image circle (42mm) — supports bigger sensors
- Lighter (6.4kg vs 9.5kg) — easier to travel with
Best for — Celestron C9.25 SCT
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
Best for — Celestron EdgeHD 8
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
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 8 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.02° × 0.68°Scale: 0.38"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.66° × 0.44°Scale: 0.38"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.32° × 0.32°Scale: 0.38"/px
Celestron C9.25 SCT — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Celestron EdgeHD 8 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.