telescopecomparison · 2-way
William Optics Ultra-Cat 108 vs William Optics Pleiades 111
William Optics
Ultra-Cat 108
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics
Pleiades 111
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Specifications
| Specification | William Optics Ultra-Cat 108 | William Optics Pleiades 111 |
|---|---|---|
| Optics | ||
| Type | refractor | astrograph |
| Optical design | Petzval (5-element advanced) | Astrograph (7-element) |
| Aperture | 108mm | 111mm |
| Focal length | 518mm | 528mm |
| Native f/ratio | f/4.8 | f/4.8 |
| Image circle | 60mm | 45mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 8.0kg | 8.0kg |
Advantages of William Optics Ultra-Cat 108
- Larger image circle (60mm) — supports bigger sensors
Advantages of William Optics Pleiades 111
Closely matched on the compared specs.
Best for — William Optics Ultra-Cat 108
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
Best for — William Optics Pleiades 111
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
William Optics Ultra-Cat 108 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.98° × 2.65°Scale: 1.50"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.60° × 1.74°Scale: 1.50"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.25° × 1.25°Scale: 1.50"/px
William Optics Pleiades 111 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.91° × 2.60°Scale: 1.47"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.55° × 1.70°Scale: 1.47"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.23° × 1.23°Scale: 1.47"/px
William Optics Ultra-Cat 108 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics Pleiades 111 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
