Thanks g__day for your explanation from your obvious experience. I have an EQ6 with heavy duty steppers and belt drives instead of the usual gears. It is all run by a Mel Bartels system. It has got a facility for PEC but I dont bother to use it as I have to set the correct point on the RA worm pulley to correspond with the software correction point. I will check it out to see if it is worth it for autoguiding.
Autoguiding is working very well without it. Is there a stand alone program to measure PE from a guidescope image?
Bert
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