Quote:
Originally Posted by rogerg
That may be true, but you'd always do more than one PEC run, and errors introduced due to viewing conditions will very easily average out after a few PEC iterations.
I typically do about 5 iterations for my LX200, that gets PE down to extremely low levels of movement, barely a few arc seconds judging by how far the star moves visually in the CCD image.
Roger.
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Ah that makes sense! Thnaks Roger. Should have thought of that - the Vixen manual is insrutable on the how to's of PEC.
My idea with the artificial star was - it does not move - your mount does - so if the tracking was perfect the "star" trail recorded would be a perfect arc of a circle. A bit of maths and you could derive the PEC curve I think...perhaps not with enough precision, I have not looked at the numbers?