telescopecomparison · 2-way
Takahashi Epsilon-130D vs William Optics RedCat 91 WIFD
Takahashi
Epsilon-130D
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics
RedCat 91 WIFD
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Key differences
+43% aperture
Faster by 1.6 f-stops
Specifications
| Specification | Takahashi Epsilon-130D | William Optics RedCat 91 WIFD |
|---|---|---|
| Optics | ||
| Type | astrograph | refractor |
| Optical design | Hyperbolic Newtonian | Petzval (5-element advanced) |
| Aperture | 130mm | 91mm |
| Focal length | 430mm | 448mm |
| Native f/ratio | f/3.3 | f/4.9 |
| Image circle | 44mm | 55mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 7.8kg | 4.7kg |
Advantages of Takahashi Epsilon-130D
- 43% more light-gathering aperture
- Faster optics at f/3.3 vs f/4.9
Advantages of William Optics RedCat 91 WIFD
- Larger image circle (55mm) — supports bigger sensors
- Lighter (4.72kg vs 7.8kg) — easier to travel with
Best for — Takahashi Epsilon-130D
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
Best for — William Optics RedCat 91 WIFD
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
Takahashi Epsilon-130D — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.80° × 3.20°Scale: 1.80"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.13° × 2.09°Scale: 1.80"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.51° × 1.51°Scale: 1.80"/px
William Optics RedCat 91 WIFD — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.60° × 3.07°Scale: 1.73"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.01° × 2.01°Scale: 1.73"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.45° × 1.45°Scale: 1.73"/px
Takahashi Epsilon-130D — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics RedCat 91 WIFD — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
