I use a Celestron CGEM for my mount. It suffers from roughly 50 arc-seconds of declination backlash…which is big. This causes big headaches when trying to autoguide. I have invented a program I call “Backlash Assistant” which dramatically reduces the effect of declination backlash while autoguiding. The program is synchronized with PHD2 Guiding and operates in parallel with PHD2 to quickly move my declination axis thru its backlash such that my autoguiding barely notices what is happening. So… What is declination backlash? Most mounts use motors coupled to multiple sets…