telescopecomparison · 2-way
Takahashi FC-100DL vs Astro-Tech AT115EDT
Takahashi
FC-100DL
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Astro-Tech
AT115EDT
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+12% focal length
-13% aperture
Slower by 2.0 f-stops
Specifications
| Specification | Takahashi FC-100DL | Astro-Tech AT115EDT |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo doublet fluorite | Apo triplet FPL-53 |
| Aperture | 100mm | 115mm |
| Focal length | 900mm | 805mm |
| Native f/ratio | f/9.0 | f/7.0 |
| Image circle | 44mm | 52mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 3.3kg | 6.6kg |
Advantages of Takahashi FC-100DL
- Tighter framing — 900mm vs 805mm focal length
- Lighter (3.3kg vs 6.6kg) — easier to travel with
Advantages of Astro-Tech AT115EDT
- Wider field — 805mm vs 900mm focal length
- 15% more light-gathering aperture
- Faster optics at f/7 vs f/9
- Larger image circle (52mm) — supports bigger sensors
Best for — Takahashi FC-100DL
- Medium-sized galaxies and planetary nebulae
- High-resolution long-exposure work
Best for — Astro-Tech AT115EDT
- 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
Astro-Tech AT115EDT — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.56° × 1.71°Scale: 0.96"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.67° × 1.12°Scale: 0.96"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.80° × 0.80°Scale: 0.96"/px
Takahashi FC-100DL — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Astro-Tech AT115EDT — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.