telescopecomparison · 2-way
Sky-Watcher Quattro 150P vs William Optics Ultra-Cat 131
Sky-Watcher
Quattro 150P
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics
Ultra-Cat 131
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
-7% focal length
+15% aperture
Faster by 0.9 f-stops
Specifications
| Specification | Sky-Watcher Quattro 150P | William Optics Ultra-Cat 131 |
|---|---|---|
| Optics | ||
| Type | newtonian | refractor |
| Optical design | Newtonian astrograph | Petzval (5-element advanced) |
| Aperture | 150mm | 131mm |
| Focal length | 600mm | 648mm |
| Native f/ratio | f/4.0 | f/4.9 |
| Image circle | — | 60mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 7.5kg | 11.3kg |
Advantages of Sky-Watcher Quattro 150P
- 15% more light-gathering aperture
- Faster optics at f/4 vs f/4.9
- Lighter (7.5kg vs 11.3kg) — easier to travel with
Advantages of William Optics Ultra-Cat 131
- Larger image circle (60mm) — supports bigger sensors
Best for — Sky-Watcher Quattro 150P
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
Best for — William Optics Ultra-Cat 131
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
Sky-Watcher Quattro 150P — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.44° × 2.29°Scale: 1.29"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.24° × 1.50°Scale: 1.29"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.08° × 1.08°Scale: 1.29"/px
William Optics Ultra-Cat 131 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.18° × 2.12°Scale: 1.20"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.08° × 1.39°Scale: 1.20"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.00° × 1.00°Scale: 1.20"/px
Sky-Watcher Quattro 150P — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
William Optics Ultra-Cat 131 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
