telescopecomparison · 2-way
Radian Raptor 61 vs ZWO Seestar S50
Key differences
+10% focal length
+22% aperture
Faster by 0.5 f-stops
Specifications
| Specification | Radian Raptor 61 | ZWO Seestar S50 |
|---|---|---|
| Optics | ||
| Type | refractor | smart-telescope |
| Optical design | Petzval quadruplet | Apo triplet all-in-one |
| Aperture | 61mm | 50mm |
| Focal length | 275mm | 250mm |
| Native f/ratio | f/4.5 | f/5.0 |
| Image circle | 44mm | — |
| Full-frame support | No | No |
| Physical | ||
| Weight | 2.6kg | 2.5kg |
Advantages of Radian Raptor 61
- 22% more light-gathering aperture
- Faster optics at f/4.5 vs f/5
- Larger image circle (44mm) — supports bigger sensors
Advantages of ZWO Seestar S50
Closely matched on the compared specs.
Best for — Radian Raptor 61
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
Best for — ZWO Seestar S50
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
Radian Raptor 61 — typical FOV & 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
ZWO Seestar S50 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 8.25° × 5.50°Scale: 3.10"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 5.39° × 3.60°Scale: 3.10"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 2.59° × 2.59°Scale: 3.10"/px
Radian Raptor 61 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
ZWO Seestar S50 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.