telescopecomparison · 2-way
Sky-Watcher Quattro 250P vs Astro-Tech AT115EDT
Sky-Watcher
Quattro 250P
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Astro-Tech
AT115EDT
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+24% focal length
+117% aperture
Faster by 3.0 f-stops
Specifications
| Specification | Sky-Watcher Quattro 250P | Astro-Tech AT115EDT |
|---|---|---|
| Optics | ||
| Type | newtonian | refractor |
| Optical design | Newtonian astrograph | Apo triplet FPL-53 |
| Aperture | 250mm | 115mm |
| Focal length | 1000mm | 805mm |
| Native f/ratio | f/4.0 | f/7.0 |
| Image circle | — | 52mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 15.5kg | 6.6kg |
Advantages of Sky-Watcher Quattro 250P
- Tighter framing — 1000mm vs 805mm focal length
- 117% more light-gathering aperture
- Faster optics at f/4 vs f/7
Advantages of Astro-Tech AT115EDT
- Wider field — 805mm vs 1000mm focal length
- Larger image circle (52mm) — supports bigger sensors
- Lighter (6.6kg vs 15.5kg) — easier to travel with
Best for — Sky-Watcher Quattro 250P
- Medium-sized galaxies and planetary nebulae
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
Best for — Astro-Tech AT115EDT
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Sky-Watcher Quattro 250P — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.06° × 1.38°Scale: 0.78"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.35° × 0.90°Scale: 0.78"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.65° × 0.65°Scale: 0.78"/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
Sky-Watcher Quattro 250P — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Astro-Tech AT115EDT — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
