telescopecomparison · 2-way
Celestron RASA 8 vs Celestron C6 SCT
Celestron
RASA 8
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
Key differences
-73% focal length
+35% aperture
Faster by 8.0 f-stops
Specifications
| Specification | Celestron RASA 8 | Celestron C6 SCT |
|---|---|---|
| Optics | ||
| Type | SCT | sct |
| Optical design | Rowe-Ackermann Schmidt | Schmidt-Cassegrain |
| Aperture | 203mm | 150mm |
| Focal length | 400mm | 1500mm |
| Native f/ratio | f/2.0 | f/10.0 |
| Image circle | 32mm | — |
| Full-frame support | No | No |
| Physical | ||
| Weight | 7.7kg | 4.5kg |
Advantages of Celestron RASA 8
- Wider field — 400mm vs 1500mm focal length
- 35% more light-gathering aperture
- Faster optics at f/2 vs f/10
- Larger image circle (32mm) — supports bigger sensors
Advantages of Celestron C6 SCT
- Tighter framing — 1500mm vs 400mm focal length
- Lighter (4.5kg vs 7.7kg) — easier to travel with
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 C6 SCT
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
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 C6 SCT — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.38° × 0.92°Scale: 0.52"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.90° × 0.60°Scale: 0.52"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.43° × 0.43°Scale: 0.52"/px
Celestron RASA 8 — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
Celestron C6 SCT — recommended user
Best suited for experienced imagers chasing detail running a portable travel rig.