telescope
Celestron
RASA 8
203mm Rowe-Ackermann Schmidt · 400mm f/2.0
Ultra-fast f/2 Rowe-Ackermann Schmidt Astrograph optimized for short exposures.
Best for
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
Specifications
| Optics | |
| Type | SCT |
| Optical design | Rowe-Ackermann Schmidt |
| Aperture | 203mm |
| Focal length | 400mm |
| Native f/ratio | f/2.0 |
| Image circle | 32mm |
| Full-frame support | No |
| Physical | |
| Weight | 7.7kg |
Typical FOV & image 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
Typical targets
- Messier M33 — Triangulum GalaxyGalaxy · 73′
- IC IC 2944 — Running Chicken NebulaEmission Nebula · 75′
- IC IC 5070 — Pelican NebulaEmission Nebula · 80′
- NGC NGC 2237 — Rosette NebulaEmission Nebula · 80′
- Messier M7 — Ptolemy's ClusterOpen Cluster · 80′
- IC IC 434 — Horsehead NebulaEmission Nebula · 60′
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Source: www.celestron.com