telescopecomparison · 2-way
William Optics GT 102 vs Tele Vue TV-76
William Optics
GT 102
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+46% focal length
+34% aperture
Slower by 0.6 f-stops
Specifications
| Specification | William Optics GT 102 | Tele Vue TV-76 |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo triplet FPL-53 | Apo doublet |
| Aperture | 102mm | 76mm |
| Focal length | 703mm | 480mm |
| Native f/ratio | f/6.9 | f/6.3 |
| Image circle | 44mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 5.6kg | 2.3kg |
Advantages of William Optics GT 102
- Tighter framing — 703mm vs 480mm focal length
- 34% more light-gathering aperture
- Larger image circle (44mm) — supports bigger sensors
Advantages of Tele Vue TV-76
- Wider field — 480mm vs 703mm focal length
- Faster optics at f/6.3 vs f/6.9
- Lighter (2.3kg vs 5.6kg) — easier to travel with
Best for — William Optics GT 102
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Tele Vue TV-76
- Large emission nebulae and star clusters
William Optics GT 102 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.93° × 1.96°Scale: 1.10"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.92° × 1.28°Scale: 1.10"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.92° × 0.92°Scale: 1.10"/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 GT 102 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Tele Vue TV-76 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.