telescopecomparison · 2-way
Celestron EdgeHD 11 vs Celestron RASA 11
Celestron
EdgeHD 11
Best suited for experienced imagers chasing detail running a permanent observatory setup.
Celestron
RASA 11
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Key differences
+352% focal length
Slower by 7.8 f-stops
Specifications
| Specification | Celestron EdgeHD 11 | Celestron RASA 11 |
|---|---|---|
| Optics | ||
| Type | sct | astrograph |
| Optical design | Aplanatic SCT | Rowe-Ackermann Schmidt Astrograph |
| Aperture | 279mm | 279mm |
| Focal length | 2800mm | 620mm |
| Native f/ratio | f/10.0 | f/2.2 |
| Image circle | 42mm | 43mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 12.7kg | 20.0kg |
Advantages of Celestron EdgeHD 11
- Tighter framing — 2800mm vs 620mm focal length
- Lighter (12.7kg vs 20kg) — easier to travel with
Advantages of Celestron RASA 11
- Wider field — 620mm vs 2800mm focal length
- Faster optics at f/2.22 vs f/10
Best for — Celestron EdgeHD 11
- 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 — 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
Celestron EdgeHD 11 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 0.74° × 0.49°Scale: 0.28"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.48° × 0.32°Scale: 0.28"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.23° × 0.23°Scale: 0.28"/px
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
Celestron EdgeHD 11 — recommended user
Best suited for experienced imagers chasing detail running a permanent observatory setup.
Celestron RASA 11 — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.