telescopecomparison · 2-way
Radian Raptor 61 vs William Optics Pleiades 68
William Optics
Pleiades 68
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Key differences
+6% focal length
-10% aperture
Slower by 0.7 f-stops
Specifications
| Specification | Radian Raptor 61 | William Optics Pleiades 68 |
|---|---|---|
| Optics | ||
| Type | refractor | astrograph |
| Optical design | Petzval quadruplet | Astrograph (7-element) |
| Aperture | 61mm | 68mm |
| Focal length | 275mm | 260mm |
| Native f/ratio | f/4.5 | f/3.8 |
| Image circle | 44mm | 48mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 2.6kg | 3.0kg |
Advantages of Radian Raptor 61
Closely matched on the compared specs.
Advantages of William Optics Pleiades 68
- 11% more light-gathering aperture
- Faster optics at f/3.8 vs f/4.5
Best for — Radian Raptor 61
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
Best for — William Optics Pleiades 68
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
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 Pleiades 68 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 7.93° × 5.29°Scale: 2.98"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 5.18° × 3.46°Scale: 2.98"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 2.49° × 2.49°Scale: 2.98"/px
Radian Raptor 61 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
William Optics Pleiades 68 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
