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Thanks for the input on the screwy stars guys. Yes, it means the left side must also be blurred somewhat unforch.
Guiding is OA and is pretty good, 2 arc sec P/P and way less than 1 arc sec RMS. High P/P can cause stars to distort, but not cause too much trouble for long exposure extended neb, which is affected more by RMS.
PA has drifted a bit over 2 yrs, hasnt been touched since installation and has settled down over a year, that could cause a problem. Im pretty sure the squareness of the cam is the problem. I have protrack on but not PEC, on installation testing that gave the best result. I havent done a Tpoint model for over a year because plate solve just stopped working (a long time ago) despite every setting being perfect. I got it working once, did the map, and that was it.
Its far away, one day ill go there and do PA, clean up, do a model, fix the cam alignment, but in the mean time its all working well enough. Mega data hides a lot of problems :-).
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