A Sky-Watcher Dobsonian Telescopes is an alt-azimuth mounted Newtonian telescope design popularized by the amateur astronomer John Dobson

The Sky-Watcher Dobsonian Telescopes have a "paraboloidal" primary mirror to eliminate spherical aberration and a four-arm, secondary- mirror bracket with fine supports, to reduce diffraction spikes and light loss. The Sky-Watcher Dobsonian Telescopes design is intended for visually observing "deep sky" objects, a requirement where the observer needs a large objective diameter (i.e. light-gathering power) combined with portability for travel to non-light polluted locations