telescopecomparison · 2-way
Takahashi Epsilon-130D vs William Optics Ultra-Cat 108
Takahashi
Epsilon-130D
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics
Ultra-Cat 108
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
-17% focal length
+20% aperture
Faster by 1.5 f-stops
Specifications
| Specification | Takahashi Epsilon-130D | William Optics Ultra-Cat 108 |
|---|---|---|
| Optics | ||
| Type | astrograph | refractor |
| Optical design | Hyperbolic Newtonian | Petzval (5-element advanced) |
| Aperture | 130mm | 108mm |
| Focal length | 430mm | 518mm |
| Native f/ratio | f/3.3 | f/4.8 |
| Image circle | 44mm | 60mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 7.8kg | 8.0kg |
Advantages of Takahashi Epsilon-130D
- Wider field — 430mm vs 518mm focal length
- 20% more light-gathering aperture
- Faster optics at f/3.3 vs f/4.8
Advantages of William Optics Ultra-Cat 108
- Tighter framing — 518mm vs 430mm focal length
- Larger image circle (60mm) — supports bigger sensors
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 Ultra-Cat 108
- 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 Ultra-Cat 108 — 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
Takahashi Epsilon-130D — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
William Optics Ultra-Cat 108 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
