telescopecomparison · 2-way
William Optics GT 81 vs Orion ED80T CF
William Optics
GT 81
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Specifications
| Specification | William Optics GT 81 | Orion ED80T CF |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo triplet FPL-53 | Apo triplet carbon fiber |
| Aperture | 81mm | 80mm |
| Focal length | 478mm | 480mm |
| Native f/ratio | f/5.9 | f/6.0 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 3.8kg | 3.4kg |
Advantages of William Optics GT 81
Closely matched on the compared specs.
Advantages of Orion ED80T CF
Closely matched on the compared specs.
Best for — William Optics GT 81
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Orion ED80T CF
- Large emission nebulae and star clusters
William Optics GT 81 — 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
Orion ED80T CF — 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 81 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Orion ED80T CF — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
