telescopecomparison · 2-way
Unistellar eVscope 2 vs William Optics RedCat 91 WIFD
Unistellar
eVscope 2
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics
RedCat 91 WIFD
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Key differences
+25% aperture
Faster by 1.0 f-stops
Specifications
| Specification | Unistellar eVscope 2 | William Optics RedCat 91 WIFD |
|---|---|---|
| Optics | ||
| Type | smart-telescope | refractor |
| Optical design | Newtonian all-in-one | Petzval (5-element advanced) |
| Aperture | 114mm | 91mm |
| Focal length | 450mm | 448mm |
| Native f/ratio | f/3.9 | f/4.9 |
| Image circle | — | 55mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 9.0kg | 4.7kg |
Advantages of Unistellar eVscope 2
- 25% more light-gathering aperture
- Faster optics at f/3.9 vs f/4.9
Advantages of William Optics RedCat 91 WIFD
- Larger image circle (55mm) — supports bigger sensors
- Lighter (4.72kg vs 9kg) — easier to travel with
Best for — Unistellar eVscope 2
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
Best for — William Optics RedCat 91 WIFD
- 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 RedCat 91 WIFD — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.60° × 3.07°Scale: 1.73"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.01° × 2.01°Scale: 1.73"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.45° × 1.45°Scale: 1.73"/px
Unistellar eVscope 2 — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics RedCat 91 WIFD — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
