telescopecomparison · 2-way
Celestron RASA 11 vs Askar SQA106
Celestron
RASA 11
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Askar
SQA106
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+7% focal length
+163% aperture
Faster by 3.3 f-stops
Specifications
| Specification | Celestron RASA 11 | Askar SQA106 |
|---|---|---|
| Optics | ||
| Type | astrograph | refractor |
| Optical design | Rowe-Ackermann Schmidt Astrograph | Quadruplet astrograph FPL-51 |
| Aperture | 279mm | 106mm |
| Focal length | 620mm | 580mm |
| Native f/ratio | f/2.2 | f/5.5 |
| Image circle | 43mm | 60mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 20.0kg | 6.5kg |
Advantages of Celestron RASA 11
- 163% more light-gathering aperture
- Faster optics at f/2.22 vs f/5.5
Advantages of Askar SQA106
- Larger image circle (60mm) — supports bigger sensors
- Lighter (6.5kg 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 SQA106
- 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 SQA106 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.56° × 2.37°Scale: 1.34"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.32° × 1.55°Scale: 1.34"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.12° × 1.12°Scale: 1.34"/px
Celestron RASA 11 — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Askar SQA106 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.