Sky-Watcher Classic 250P (10-inch Dobsonian) vs Sky-Watcher Flextube 300P (12-inch Dobsonian): specs compared
Updated 05 September 2026.
305 mm
Sky-Watcher Flextube 300P (12-inch Dobsonian) wins on aperture
On aperture, Sky-Watcher Flextube 300P (12-inch Dobsonian) leads: 305 mm versus 254 mm.
| Spec | Sky-Watcher Classic 250P (10-inch Dobsonian) | Sky-Watcher Flextube 300P (12-inch Dobsonian) |
|---|---|---|
| Aperture | 254 mm (10 in) | 305 mm (12.01 in) |
| Focal length | 1200 mm | 1500 mm |
| Focal ratio | f/4.7 | f/4.9 |
| Optical design | Newtonian reflector (parabolic primary) | Newtonian reflector (parabolic primary, collapsible) |
| Focuser / eyepiece barrel | 2 in Crayford focuser with a 1.25 in adapter | 2 in Crayford focuser with a 1.25 in adapter |
| Mount | Manual Dobsonian base | Manual collapsible Dobsonian base |
| Highest useful magnification (2x aperture rule) | about 508x | about 610x |
| Optical tube weight | 30 lb |
Questions and answers
Which has the higher aperture, Sky-Watcher Classic 250P (10-inch Dobsonian) or Sky-Watcher Flextube 300P (12-inch Dobsonian)?
On aperture, Sky-Watcher Flextube 300P (12-inch Dobsonian) leads: 305 mm versus 254 mm.
How do Sky-Watcher Classic 250P (10-inch Dobsonian) and Sky-Watcher Flextube 300P (12-inch Dobsonian) compare?
On aperture, Sky-Watcher Flextube 300P (12-inch Dobsonian) leads: 305 mm versus 254 mm.