telescopecomparison · 2-way
Celestron RASA 8 vs Celestron EdgeHD 11
Celestron
RASA 8
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
Celestron
EdgeHD 11
Best suited for experienced imagers chasing detail running a permanent observatory setup.
Key differences
-86% focal length
-27% aperture
Faster by 8.0 f-stops
Specifications
| Specification | Celestron RASA 8 | Celestron EdgeHD 11 |
|---|---|---|
| Optics | ||
| Type | SCT | sct |
| Optical design | Rowe-Ackermann Schmidt | Aplanatic SCT |
| Aperture | 203mm | 279mm |
| Focal length | 400mm | 2800mm |
| Native f/ratio | f/2.0 | f/10.0 |
| Image circle | 32mm | 42mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 7.7kg | 12.7kg |
Advantages of Celestron RASA 8
- Wider field — 400mm vs 2800mm focal length
- Faster optics at f/2 vs f/10
- Lighter (7.7kg vs 12.7kg) — easier to travel with
Advantages of Celestron EdgeHD 11
- Tighter framing — 2800mm vs 400mm focal length
- 37% more light-gathering aperture
- Larger image circle (42mm) — supports bigger sensors
Best for — Celestron RASA 8
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
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
Celestron RASA 8 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 5.16° × 3.44°Scale: 1.94"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.37° × 2.25°Scale: 1.94"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.62° × 1.62°Scale: 1.94"/px
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 8 — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
Celestron EdgeHD 11 — recommended user
Best suited for experienced imagers chasing detail running a permanent observatory setup.