Quote:
Originally Posted by Paul Haese
Hi Ray,
I had not considered that as I generally don't try to chase the seeing but I might just give that a try. I have been doing sub exposures pretty long between 4-10 seconds and that is generally selected by CCDAP as a setting I have to ensure good guide stars. I have PEC data on the dome computer I will chase this up and post it here. Several PMX users in the southern hemisphere say that the correction does not see to work properly even when you reverse the side of the meridian and I a have found that too. Perhaps you will see a corresponding similarity.
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could be worth a try - expect a lot noisier error graph, but if the stars end up rounder you may be able to find an optimum compromise between seeing noise and guide loop speed....
I guess that even a slight imbalance in RA could mean that the worm and the 4 bearings that locate it would be loaded differently on east and west sides. Could that possibly explain why you seem to get no advantage from PEC - the PE is maybe not consistent east and west?