Product Features            Diameter/Aperture: 150mm     Focal Length: 750mm     Diffraction-limited secondary mirror support     Paraboloidal (parabolic) primary mirror     150 primary mirror gathers enough light to reveal deep-sky luminaries. 33% more light gathering power than 130mm, 73% more light than 114mm     6x30 achromatic finderscope for easy location of objects     Smooth rack-and-pinion 1.25" focuser.        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.                    Specifications                                 Optical Design        Newtonian (Parabolic)                     Optical Diameter        150mm                     Focal Length        750mm                     F/Ratio        F/5                     Secondary Mirror Diameter        47mm                     Highest Practical Power        300x                     Faintest Steller Magnitude        13.6                     Finder Scope        6x30*                     Focuser Diameter        2" with 1.25 adapter                     Eyepieces        1.25 Super 25 and 10*