I just spent a nice cold night out measuring the Periodic Error on my Paramount ME and can say I’m very happy
Assuming I did everything correct I measured my PE at +1.1/-1.5 or just shy of 2.5arc/sec peak to peak PE
and PemPro Shows it can get this down to +0.4/-0.5
I measured for 5 Work Cycles with 1 second exposure on my AT10RC with a STL-11000M2 Camera
MaximDL was driving the Camera and of course TheSkyX the Mount.
here’s are some screen shots from PemPro 2.