telescopecomparison · 2-way
Takahashi FC-100DL vs Takahashi TSA-120
Takahashi
FC-100DL
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.
Key differences
-17% aperture
Slower by 1.5 f-stops
Specifications
| Specification | Takahashi FC-100DL | Takahashi TSA-120 |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Apo doublet fluorite | Triplet APO |
| Aperture | 100mm | 120mm |
| Focal length | 900mm | 900mm |
| Native f/ratio | f/9.0 | f/7.5 |
| Image circle | 44mm | 44mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 3.3kg | 7.5kg |
Advantages of Takahashi FC-100DL
- Lighter (3.3kg vs 7.5kg) — easier to travel with
Advantages of Takahashi TSA-120
- 20% more light-gathering aperture
- Faster optics at f/7.5 vs f/9
Best for — Takahashi FC-100DL
- Medium-sized galaxies and planetary nebulae
- High-resolution long-exposure work
Best for — Takahashi TSA-120
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Takahashi FC-100DL — 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
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
Takahashi FC-100DL — 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.
