Quattro 250P — 250/1000 imaging Newtonian The Quattro 250P is a fast parabolic imaging Newtonian with a nominal 250 mm aperture and 1000 mm native focal length at f/4. Its low-expansion borosilicate primary is intended to reduce sensitivity to changing temperature during an imaging session.
Manufacturer model: Quattro 250P — 250/1000 imaging Newtonian · Specifications checked against manufacturer data on 2026-11-04
The Quattro 250P is a fast parabolic imaging Newtonian with a nominal 250 mm aperture and 1000 mm native focal length at f/4. Its low-expansion borosilicate primary is intended to reduce sensitivity to changing temperature during an imaging session.
Use a matching f/4 coma corrector to improve off-axis star shapes when imaging. Corrector spacing and camera adapters must follow the specification of the chosen corrector. A reduced focal ratio is not assigned to the native optical tube.
A 2-inch dual-speed linear-power focuser supports precise camera focus. Thin 0.5 mm secondary vanes and ray-traced internal baffles reduce diffraction/stray-light effects. The listed finder is 8×50.
The manufacturer’s published tube mass is 15.1 kg. The global table identifies the physical optical diameter as 254 mm; the nominal product designation is retained.
Sky-Watcher manufacturer documentation
Global nominal and published optical diameter distinguished; suspect global tube dimensions omitted rather than copied.
| Nominal aperture (mm) | 250 |
|---|---|
| Primary mirror material | Low-expansion borosilicate glass |
| Published optical diameter (mm) | 254 |
| Secondary spider thickness (mm) | 0.5 |
| Stray light control | Ray-traced internal baffles |
Data sheet
Quattro 250P — 250/1000 imaging Newtonian The Quattro 250P is a fast parabolic imaging Newtonian with a nominal 250 mm aperture and 1000 mm native focal length at f/4. Its low-expansion borosilicate primary is intended to reduce sensitivity to changing temperature during an imaging session.
Manufacturer model: Quattro 250P — 250/1000 imaging Newtonian · Specifications checked against manufacturer data on 2026-11-04
