telescope
Celestron
RASA 11
279mm Rowe-Ackermann Schmidt Astrograph · 620mm f/2.2
Ultra-fast astrograph.
Best for
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
Specifications
| Optics | |
| Type | astrograph |
| Optical design | Rowe-Ackermann Schmidt Astrograph |
| Aperture | 279mm |
| Focal length | 620mm |
| Native f/ratio | f/2.2 |
| Image circle | 43mm |
| Full-frame support | Yes |
| Physical | |
| Weight | 20.0kg |
Typical FOV & image 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
Typical targets
- Messier M17 — Omega NebulaEmission Nebula · 46′
- NGC NGC 1893 — Emission Nebula NGC 1893Emission Nebula · 45′
- NGC NGC 6357 — Lobster NebulaEmission Nebula · 50′
- IC IC 443 — Jellyfish NebulaSupernova Remnant · 50′
- NGC NGC 2070 — Tarantula NebulaEmission Nebula · 40′
- NGC NGC 6334 — Cat's Paw NebulaEmission Nebula · 40′
Recommended cameras
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Compare pairing28.3mm sensor · 3.76µm px · cooled
Compare pairing