The GPD2 equatorial mount is the stronger and heftier of the GP mounts. With its solid steel R. A. and Declination axes and brass worm gears, this mount will hold up to years of heavy use. In order to assure accurate tracking for astrophotography the worm gears are especially machined to a very high precision that minimizes periodic error. The GPD2 Mount is equipped with a polar axis scope with a built in illuminator. The GPD2 holds almost 50% more weight than the GP2.