telescopecomparison · 2-way
William Optics Zenithstar 81 II vs Tele Vue TV-76
William Optics
Zenithstar 81 II
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Key differences
+7% aperture
Faster by 0.4 f-stops
Specifications
| Specification | William Optics Zenithstar 81 II | Tele Vue TV-76 |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo doublet FPL-53 | Apo doublet |
| Aperture | 81mm | 76mm |
| Focal length | 478mm | 480mm |
| Native f/ratio | f/5.9 | f/6.3 |
| Image circle | 44mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 3.6kg | 2.3kg |
Advantages of William Optics Zenithstar 81 II
- Faster optics at f/5.9 vs f/6.3
- Larger image circle (44mm) — supports bigger sensors
Advantages of Tele Vue TV-76
- Lighter (2.3kg vs 3.6kg) — easier to travel with
Best for — William Optics Zenithstar 81 II
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Tele Vue TV-76
- Large emission nebulae and star clusters
William Optics Zenithstar 81 II — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.32° × 2.88°Scale: 1.62"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.82° × 1.88°Scale: 1.62"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.35° × 1.35°Scale: 1.62"/px
Tele Vue TV-76 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.30° × 2.86°Scale: 1.62"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.81° × 1.87°Scale: 1.62"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.35° × 1.35°Scale: 1.62"/px
William Optics Zenithstar 81 II — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Tele Vue TV-76 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.