telescopecomparison · 2-way
Unistellar eVscope 2 vs William Optics Ultra-Cat 108
Unistellar
eVscope 2
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics
Ultra-Cat 108
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
-13% focal length
+6% aperture
Faster by 0.9 f-stops
Specifications
| Specification | Unistellar eVscope 2 | William Optics Ultra-Cat 108 |
|---|---|---|
| Optics | ||
| Type | smart-telescope | refractor |
| Optical design | Newtonian all-in-one | Petzval (5-element advanced) |
| Aperture | 114mm | 108mm |
| Focal length | 450mm | 518mm |
| Native f/ratio | f/3.9 | f/4.8 |
| Image circle | — | 60mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 9.0kg | 8.0kg |
Advantages of Unistellar eVscope 2
- Wider field — 450mm vs 518mm focal length
- Faster optics at f/3.9 vs f/4.8
Advantages of William Optics Ultra-Cat 108
- Tighter framing — 518mm vs 450mm focal length
- Larger image circle (60mm) — supports bigger sensors
Best for — Unistellar eVscope 2
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
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
Unistellar eVscope 2 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.58° × 3.06°Scale: 1.72"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.99° × 2.00°Scale: 1.72"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.44° × 1.44°Scale: 1.72"/px
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
Unistellar eVscope 2 — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics Ultra-Cat 108 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
