telescopecomparison · 2-way
William Optics RedCat 71 WIFD vs William Optics Ultra-Cat 76
William Optics
RedCat 71 WIFD
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
-7% aperture
Specifications
| Specification | William Optics RedCat 71 WIFD | William Optics Ultra-Cat 76 |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Petzval APO | Petzval (5-element advanced) |
| Aperture | 71mm | 76mm |
| Focal length | 350mm | 365mm |
| Native f/ratio | f/4.9 | f/4.8 |
| Image circle | 45mm | 50mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 2.7kg | 3.8kg |
Advantages of William Optics RedCat 71 WIFD
- Lighter (2.7kg vs 3.81kg) — easier to travel with
Advantages of William Optics Ultra-Cat 76
Closely matched on the compared specs.
Best for — William Optics RedCat 71 WIFD
- Wide-field nebulae and Milky Way regions
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
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
William Optics RedCat 71 WIFD — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 5.89° × 3.93°Scale: 2.22"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.85° × 2.57°Scale: 2.22"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.85° × 1.85°Scale: 2.22"/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
William Optics RedCat 71 WIFD — 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.
