telescopecomparison · 2-way
Celestron EdgeHD 8 vs Celestron RASA 8
Celestron
EdgeHD 8
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Celestron
RASA 8
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
Key differences
+408% focal length
Slower by 8.0 f-stops
Specifications
| Specification | Celestron EdgeHD 8 | Celestron RASA 8 |
|---|---|---|
| Optics | ||
| Type | SCT | SCT |
| Optical design | Aplanatic SCT | Rowe-Ackermann Schmidt |
| Aperture | 203mm | 203mm |
| Focal length | 2032mm | 400mm |
| Native f/ratio | f/10.0 | f/2.0 |
| Image circle | 42mm | 32mm |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 6.4kg | 7.7kg |
Advantages of Celestron EdgeHD 8
- Tighter framing — 2032mm vs 400mm focal length
- Larger image circle (42mm) — supports bigger sensors
- Lighter (6.4kg vs 7.7kg) — easier to travel with
Advantages of Celestron RASA 8
- Wider field — 400mm vs 2032mm focal length
- Faster optics at f/2 vs f/10
Best for — Celestron EdgeHD 8
- 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 8
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
Celestron EdgeHD 8 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.02° × 0.68°Scale: 0.38"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.66° × 0.44°Scale: 0.38"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.32° × 0.32°Scale: 0.38"/px
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 8 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Celestron RASA 8 — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.