Skywatcher AUTO FOCUSING MOTORWhen you are trying to adjust the focus of the telescope, it is unavoidably cause some vibration on the telescope and might be very hard to find proper focus, especially when you are using high magnification telescope. The Sky Watcher Auto Focusing Motor is a hands free focusing device that allows accurate focusing of your telescope with the minimum of vibration. It has dual speed push buttons for fast and slow focusing rate. It can be used with a