Orion 10010 Atlas Pro AZ/EQ-G Computerized GoTo Telescope Mount Three-in-one GoTo mount can operate in GoTo Equatorial mode holding one telescope, or in GoTo Altazimuth mode holding one or two different telescopes Capable of holding a 44-pound telescope payload - ideal for any observational or astrophotographic pursuits Accurate belt-driven stepper motor drive system can locate any of over 42,000 celestial curiosities with a pointing accuracy of 5 arc-minutes and a tracking precision of 0 1436 arc-second steps