telescopecomparison · 2-way
Vixen SD115S vs Takahashi TSA-120
Vixen
SD115S
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Takahashi
TSA-120
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Specifications
| Specification | Vixen SD115S | Takahashi TSA-120 |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Apo doublet SD | Triplet APO |
| Aperture | 115mm | 120mm |
| Focal length | 890mm | 900mm |
| Native f/ratio | f/7.7 | f/7.5 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 4.8kg | 7.5kg |
Advantages of Vixen SD115S
- Lighter (4.8kg vs 7.5kg) — easier to travel with
Advantages of Takahashi TSA-120
Closely matched on the compared specs.
Best for — Vixen SD115S
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Takahashi TSA-120
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Vixen SD115S — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.32° × 1.55°Scale: 0.87"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.51° × 1.01°Scale: 0.87"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.73° × 0.73°Scale: 0.87"/px
Takahashi TSA-120 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.29° × 1.53°Scale: 0.86"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.50° × 1.00°Scale: 0.86"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.72° × 0.72°Scale: 0.86"/px
Vixen SD115S — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Takahashi TSA-120 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
