telescopecomparison · 2-way
Unistellar Odyssey vs William Optics Ultra-Cat 76
Unistellar
Odyssey
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
William Optics
Ultra-Cat 76
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Key differences
-12% focal length
+12% aperture
Faster by 0.9 f-stops
Specifications
| Specification | Unistellar Odyssey | William Optics Ultra-Cat 76 |
|---|---|---|
| Optics | ||
| Type | smart-telescope | refractor |
| Optical design | Newtonian reflector all-in-one | Petzval (5-element advanced) |
| Aperture | 85mm | 76mm |
| Focal length | 320mm | 365mm |
| Native f/ratio | f/3.9 | f/4.8 |
| Image circle | — | 50mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 4.0kg | 3.8kg |
Advantages of Unistellar Odyssey
- Wider field — 320mm vs 365mm focal length
- 12% more light-gathering aperture
- Faster optics at f/3.9 vs f/4.8
Advantages of William Optics Ultra-Cat 76
- Tighter framing — 365mm vs 320mm focal length
- Larger image circle (50mm) — supports bigger sensors
Best for — Unistellar Odyssey
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
Best for — William Optics Ultra-Cat 76
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
Unistellar Odyssey — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 6.45° × 4.30°Scale: 2.42"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 4.21° × 2.81°Scale: 2.42"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 2.02° × 2.02°Scale: 2.42"/px
William Optics Ultra-Cat 76 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 5.65° × 3.77°Scale: 2.12"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.69° × 2.46°Scale: 2.12"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.77° × 1.77°Scale: 2.12"/px
Unistellar Odyssey — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
William Optics Ultra-Cat 76 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
