telescopecomparison · 2-way
Celestron EdgeHD 9.25 vs Astro-Tech AT8RC
Celestron
EdgeHD 9.25
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Key differences
+45% focal length
+16% aperture
Slower by 2.0 f-stops
Specifications
| Specification | Celestron EdgeHD 9.25 | Astro-Tech AT8RC |
|---|---|---|
| Optics | ||
| Type | SCT | RC |
| Optical design | Aplanatic SCT | Ritchey-Chrétien |
| Aperture | 235mm | 203mm |
| Focal length | 2350mm | 1624mm |
| Native f/ratio | f/10.0 | f/8.0 |
| Image circle | 42mm | 42mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 9.5kg | 10.0kg |
Advantages of Celestron EdgeHD 9.25
- Tighter framing — 2350mm vs 1624mm focal length
- 16% more light-gathering aperture
Advantages of Astro-Tech AT8RC
- Wider field — 1624mm vs 2350mm focal length
- Faster optics at f/8 vs f/10
Best for — Celestron EdgeHD 9.25
- 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 — Astro-Tech AT8RC
- 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 EdgeHD 9.25 — 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
Astro-Tech AT8RC — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.27° × 0.85°Scale: 0.48"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.83° × 0.55°Scale: 0.48"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.40° × 0.40°Scale: 0.48"/px
Celestron EdgeHD 9.25 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Astro-Tech AT8RC — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.