designed to be ergonomically friendly with large Altitude and Azimuth adjustment knobs for quick and easy polar alignment adjustment Permanent periodic error correction (PEC) which will allow users to train out the worm gears periodic errors, while the mount retains the PEC recordings Capable of holding 40 lb of payload and slewing at 5 degree per second, you will be able to instantly point to any of the celestial objects in the database series features Celestrons innovative Polar alignment procedure called All-Star. All-Star allows users to choose any bright star, while the software calculates and assists with polar alignment For objects near the Meridian (imaginary line passing from North to South), the CGEM II will track well past the Meridian for uninterrupted imaging through the most ideal part of the sky. The CGEM II mount has a robust database with over 40,000 objects, 100 user defined programmable objects and enhanced information on over 200 objects