telescopecomparison · 2-way
William Optics Ultra-Cat 76 vs William Optics RedCat 71 WIFD
William Optics
Ultra-Cat 76
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
William Optics
RedCat 71 WIFD
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Key differences
+7% aperture
Specifications
| Specification | William Optics Ultra-Cat 76 | William Optics RedCat 71 WIFD |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Petzval (5-element advanced) | Petzval APO |
| Aperture | 76mm | 71mm |
| Focal length | 365mm | 350mm |
| Native f/ratio | f/4.8 | f/4.9 |
| Image circle | 50mm | 45mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 3.8kg | 2.7kg |
Advantages of William Optics Ultra-Cat 76
Closely matched on the compared specs.
Advantages of William Optics RedCat 71 WIFD
- Lighter (2.7kg vs 3.81kg) — easier to travel with
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
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
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 — 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 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
William Optics RedCat 71 WIFD — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
