telescopecomparison · 2-way
Sky-Watcher Quattro 250P vs Vixen SD115S
Sky-Watcher
Quattro 250P
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Vixen
SD115S
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
+12% focal length
+117% aperture
Faster by 3.7 f-stops
Specifications
| Specification | Sky-Watcher Quattro 250P | Vixen SD115S |
|---|---|---|
| Optics | ||
| Type | newtonian | refractor |
| Optical design | Newtonian astrograph | Apo doublet SD |
| Aperture | 250mm | 115mm |
| Focal length | 1000mm | 890mm |
| Native f/ratio | f/4.0 | f/7.7 |
| Image circle | — | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 15.5kg | 4.8kg |
Advantages of Sky-Watcher Quattro 250P
- Tighter framing — 1000mm vs 890mm focal length
- 117% more light-gathering aperture
- Faster optics at f/4 vs f/7.7
Advantages of Vixen SD115S
- Wider field — 890mm vs 1000mm focal length
- Larger image circle (44mm) — supports bigger sensors
- Lighter (4.8kg 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 — Vixen SD115S
- 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
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
Sky-Watcher Quattro 250P — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Vixen SD115S — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.