Sky-Watcher Classic 250P 10" Dobsonian Telescope

10-inch Dobsonian for deep-sky observers

The Sky-Watcher Classic 250P is a 10-inch Newtonian reflector on a traditional Dobsonian mount. Its 254mm aperture gathers 1235 times more light than the unaided eye, making it suitable for visual observers who want to see faint nebulae and galaxies. The parabolic borosilicate mirror is coated for 94% reflectivity, delivering bright, high-contrast images. It serves both beginners and experienced stargazers seeking large aperture at a practical cost.

Borosilicate mirror and stable alt-azimuth base

The primary mirror uses low-expansion borosilicate glass polished to a parabolic figure, minimising chromatic aberration across the field. Sky-Watcher's Radiant Aluminum Quartz coating achieves 94% reflectivity to preserve light throughput. The Dobsonian mount provides a low centre of gravity and smooth alt-azimuth motion, allowing intuitive manual tracking without the complexity of equatorial alignment. The simple rocker box design keeps vibrations low during high-power planetary work.

Passive cooling and manual operation

With no motors or electronics, the telescope runs silently and draws no power in the field. The open-tube design lets the 254mm mirror reach thermal equilibrium naturally, reducing tube currents that degrade sharpness. Magnifications up to 500x are achievable when seeing conditions allow, though typical nights will favour lower powers. Observers who need automated tracking or a compact instrument for frequent transport should consider other designs.