When I started using my new EQ6 AZ GT mount, I was wondering how good it would perform on tracking short term exposures. This mount is used mainly for robotic observation of variable stars, so if it would track without errors for 30 seconds this would be fine.

Here we see that the periodic error of the mount is pretty... periodic. This means that with PEC this mount can eliminate tracking errors quite a bit.

>Now we see that IF (!!) we would use PEC, the residual error would be +-1.5 arcseconds. Combined with the VMC200l+ST8xme and 2x2 binning this error wouldn't even be noticable, even for longer exposures.

Using Fourrier-frequency analysis, we see that there are not much high-frequency errors. This is what I was really interested about.

I can only conclude that this is a pretty good mount for its price. Probably most of the errors are smoothed out by the use of the drivebelts in this mount.