telescopecomparison · 2-way
William Optics RedCat 61 vs Radian Raptor 61
William Optics
RedCat 61
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Key differences
+9% focal length
Slower by 0.4 f-stops
Specifications
| Specification | William Optics RedCat 61 | Radian Raptor 61 |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Petzval APO | Petzval quadruplet |
| Aperture | 61mm | 61mm |
| Focal length | 300mm | 275mm |
| Native f/ratio | f/4.9 | f/4.5 |
| Image circle | 45mm | 44mm |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 2.0kg | 2.6kg |
Advantages of William Optics RedCat 61
- Lighter (2kg vs 2.6kg) — easier to travel with
Advantages of Radian Raptor 61
- Faster optics at f/4.5 vs f/4.9
Best for — William Optics RedCat 61
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
Best for — Radian Raptor 61
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
William Optics RedCat 61 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 6.88° × 4.58°Scale: 2.59"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 4.49° × 3.00°Scale: 2.59"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 2.16° × 2.16°Scale: 2.59"/px
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
William Optics RedCat 61 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Radian Raptor 61 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.