telescopecomparison · 2-way
William Optics RedCat 91 vs SharpStar 94EDPH
William Optics
RedCat 91
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
SharpStar
94EDPH
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Specifications
| Specification | William Optics RedCat 91 | SharpStar 94EDPH |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Petzval APO | Apo triplet FPL-53 |
| Aperture | 91mm | 94mm |
| Focal length | 496mm | 518mm |
| Native f/ratio | f/5.5 | f/5.5 |
| Image circle | 45mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 4.3kg | 4.5kg |
Advantages of William Optics RedCat 91
Closely matched on the compared specs.
Advantages of SharpStar 94EDPH
Closely matched on the compared specs.
Best for — William Optics RedCat 91
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — SharpStar 94EDPH
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
William Optics RedCat 91 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.16° × 2.77°Scale: 1.56"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.71° × 1.81°Scale: 1.56"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.31° × 1.31°Scale: 1.56"/px
SharpStar 94EDPH — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.98° × 2.65°Scale: 1.50"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.60° × 1.74°Scale: 1.50"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.25° × 1.25°Scale: 1.50"/px
William Optics RedCat 91 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
SharpStar 94EDPH — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.