telescopecomparison · 2-way
Celestron RASA 11 vs Askar FRA600
Celestron
RASA 11
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Askar
FRA600
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+158% aperture
Faster by 3.4 f-stops
Specifications
| Specification | Celestron RASA 11 | Askar FRA600 |
|---|---|---|
| Optics | ||
| Type | astrograph | Refractor |
| Optical design | Rowe-Ackermann Schmidt Astrograph | Petzval Quintuplet APO |
| Aperture | 279mm | 108mm |
| Focal length | 620mm | 600mm |
| Native f/ratio | f/2.2 | f/5.6 |
| Image circle | 43mm | 60mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 20.0kg | 7.8kg |
Advantages of Celestron RASA 11
- 158% more light-gathering aperture
- Faster optics at f/2.22 vs f/5.6
Advantages of Askar FRA600
- Larger image circle (60mm) — supports bigger sensors
- Lighter (7.8kg vs 20kg) — easier to travel with
Best for — Celestron RASA 11
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- 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 RASA 11 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.33° × 2.22°Scale: 1.25"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.17° × 1.45°Scale: 1.25"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.04° × 1.04°Scale: 1.25"/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 RASA 11 — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Askar FRA600 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.