Sky-Watcher 200mm Black Diamond Newtonian  & Goto EQ5Pro Mount. The Sky-Watcher paraboloidal (parabolic) mirror reflectors and all Dobsonian models feature a four-arm, secondary-mirror bracket with fine supports (0.5mm thick), to reduce diffraction spikes and light loss. Paraboloidal (parabolic) 200mm primary mirror gives magnificent images of deep-sky objects. The Black Diamond 200mm collects 78% more light than 150mm and137% more light than 130mm Featuring 1.5" Steel tripod legs for maximum stability this package is perfect instrument for serious amateur.