I recently purchased a secondhand EQ4 mount (GP Clone by the looks of it) with dual drives. I have only now been able to put this mount to the astrophotography test. It looks like it has the potential except for one little irksome factor, the RA drive runs too slow/fast (?). I haven't really checked which yet, but the star was definately drifting 'up' at quite a rate. (I was using an SBIG in a refractor without a diagonal with the base of the SBIG in line with the RA direction of travel. I'm not used to how the SBIG orientates yet as it was first light for it as well
) Since then I haven't had the opportunity to check it with a camera I am more familiar with using.
There was a thread a short while ago about a similar problem but I have been unable to find it. Not being an electrical guru I don't really know where to start. Does anyone have any suggestions on what might be going on?