telescopecomparison · 2-way
Astro-Tech AT115EDT vs Takahashi FC-100DZ
Astro-Tech
AT115EDT
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Takahashi
FC-100DZ
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
+15% aperture
Faster by 1.0 f-stops
Specifications
| Specification | Astro-Tech AT115EDT | Takahashi FC-100DZ |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo triplet FPL-53 | Apo doublet fluorite |
| Aperture | 115mm | 100mm |
| Focal length | 805mm | 800mm |
| Native f/ratio | f/7.0 | f/8.0 |
| Image circle | 52mm | 44mm |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 6.6kg | 3.3kg |
Advantages of Astro-Tech AT115EDT
- 15% more light-gathering aperture
- Faster optics at f/7 vs f/8
- Larger image circle (52mm) — supports bigger sensors
Advantages of Takahashi FC-100DZ
- Lighter (3.3kg vs 6.6kg) — easier to travel with
Best for — Astro-Tech AT115EDT
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Takahashi FC-100DZ
- Medium-sized galaxies and planetary nebulae
- High-resolution long-exposure work
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-100DZ — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.58° × 1.72°Scale: 0.97"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.68° × 1.12°Scale: 0.97"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.81° × 0.81°Scale: 0.97"/px
Astro-Tech AT115EDT — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Takahashi FC-100DZ — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
