Polarize Star Tracker Mount - This compact mount platform allows you to capture night scopes and star images with ease. Set up is simple. The Polarize attaches to a standard camera tripod and can accept any digital camera weighing up to 3.5lbs. Using the included compass on the Polarize, orient the mount to face north. The Polarize features a North Star alignment window that you point at Polaris. The Polarize can also use a polar scope for alignment. Once set, the Polarize tracks with the motion of the stars to eliminate star trailing on your images resulting in sharp images of the Universe. The Polarize uses very accurate stepping motors and operates on 2 AA batteries. Polarize is designed to not only be functional, but also to be compact and attractive. The Polarize has a smooth, good looking design. The unit has no visible screws and although, not waterproof, it is designed to function in most weather conditions. Type Star Tracker Tracking Mode Celestial tracking rate1/2 of celestial tracking rate. Solar tracking rate Mean solar timeLunar tracking rate Mean lunar timeUsable in both northern and southern hemispheres Standard accessory: Compass Dimensions 9513758mm (3.7x5.9x2.3 inches) Weight 1.4 lbs. (without batteries)