telescope
Radian
Raptor 61
61mm Petzval quadruplet · 275mm f/4.5
Fast compact quadruplet.
Best for
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
Specifications
| Optics | |
| Type | refractor |
| Optical design | Petzval quadruplet |
| Aperture | 61mm |
| Focal length | 275mm |
| Native f/ratio | f/4.5 |
| Image circle | 44mm |
| Full-frame support | No |
| Physical | |
| Weight | 2.6kg |
Typical FOV & image scale
With Full-frame (36×24mm, 3.76µm)
FOV 7.50° × 5.00°
Scale 2.82″/px
With APS-C (23.5×15.7mm, 3.76µm)
FOV 4.90° × 3.27°
Scale 2.82″/px
With IMX533 square (11.3×11.3mm, 3.76µm)
FOV 2.35° × 2.35°
Scale 2.82″/px
Typical targets
- Messier M45 — PleiadesReflection Nebula · 110′
- Messier M44 — Beehive ClusterOpen Cluster · 95′
- Messier M8 — Lagoon NebulaEmission Nebula · 90′
- Messier M24 — Sagittarius Star CloudOpen Cluster · 90′
- NGC NGC 7000 — North America NebulaEmission Nebula · 120′
- IC IC 2177 — Seagull NebulaEmission Nebula · 120′
Recommended cameras
28.4mm sensor · 4.78µm px · cooled
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Compare pairing28.3mm sensor · 3.76µm px · cooled
Compare pairing