telescope
Orion
8" f/3.9 Newtonian Astrograph
203mm Newtonian astrograph · 800mm f/3.9
Fast imaging Newtonian.
Best for
- Medium-sized galaxies and planetary nebulae
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
Specifications
| Optics | |
| Type | newtonian |
| Optical design | Newtonian astrograph |
| Aperture | 203mm |
| Focal length | 800mm |
| Native f/ratio | f/3.9 |
| Image circle | — |
| Full-frame support | No |
| Physical | |
| Weight | 10.5kg |
Typical FOV & image scale
With Full-frame (36×24mm, 3.76µm)
FOV 2.58° × 1.72°
Scale 0.97″/px
With APS-C (23.5×15.7mm, 3.76µm)
FOV 1.68° × 1.12°
Scale 0.97″/px
With IMX533 square (11.3×11.3mm, 3.76µm)
FOV 0.81° × 0.81°
Scale 0.97″/px
Typical targets
- Messier M16 — Eagle NebulaEmission Nebula · 35′
- NGC NGC 281 — Pacman NebulaEmission Nebula · 35′
- Messier M34 — Open Cluster M34Open Cluster · 35′
- NGC NGC 5139 — Omega CentauriGlobular Cluster · 36′
- IC IC 405 — Flaming Star NebulaEmission Nebula · 37′
- Messier M41 — Open Cluster M41Open Cluster · 38′
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