telescopecomparison · 2-way
Celestron RASA 11 vs SharpStar 100QII
Celestron
RASA 11
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
SharpStar
100QII
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+13% focal length
+179% aperture
Faster by 3.3 f-stops
Specifications
| Specification | Celestron RASA 11 | SharpStar 100QII |
|---|---|---|
| Optics | ||
| Type | astrograph | refractor |
| Optical design | Rowe-Ackermann Schmidt Astrograph | Quadruplet astrograph |
| Aperture | 279mm | 100mm |
| Focal length | 620mm | 550mm |
| Native f/ratio | f/2.2 | f/5.5 |
| Image circle | 43mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 20.0kg | 5.5kg |
Advantages of Celestron RASA 11
- Tighter framing — 620mm vs 550mm focal length
- 179% more light-gathering aperture
- Faster optics at f/2.22 vs f/5.5
Advantages of SharpStar 100QII
- Wider field — 550mm vs 620mm focal length
- Lighter (5.5kg 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 — SharpStar 100QII
- 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
SharpStar 100QII — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.75° × 2.50°Scale: 1.41"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.45° × 1.64°Scale: 1.41"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.18° × 1.18°Scale: 1.41"/px
Celestron RASA 11 — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
SharpStar 100QII — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
