telescopecomparison · 2-way
Celestron EdgeHD 9.25 vs Askar FRA600
Celestron
EdgeHD 9.25
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Askar
FRA600
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+292% focal length
+118% aperture
Slower by 4.4 f-stops
Specifications
| Specification | Celestron EdgeHD 9.25 | Askar FRA600 |
|---|---|---|
| Optics | ||
| Type | SCT | Refractor |
| Optical design | Aplanatic SCT | Petzval Quintuplet APO |
| Aperture | 235mm | 108mm |
| Focal length | 2350mm | 600mm |
| Native f/ratio | f/10.0 | f/5.6 |
| Image circle | 42mm | 60mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 9.5kg | 7.8kg |
Advantages of Celestron EdgeHD 9.25
- Tighter framing — 2350mm vs 600mm focal length
- 118% more light-gathering aperture
Advantages of Askar FRA600
- Wider field — 600mm vs 2350mm focal length
- Faster optics at f/5.6 vs f/10
- Larger image circle (60mm) — supports bigger sensors
- Lighter (7.8kg vs 9.5kg) — easier to travel with
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 — Askar FRA600
- Large emission nebulae and star clusters
- 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
Askar FRA600 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.44° × 2.29°Scale: 1.29"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.24° × 1.50°Scale: 1.29"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.08° × 1.08°Scale: 1.29"/px
Celestron EdgeHD 9.25 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Askar FRA600 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.