Quote:
Originally Posted by JohnH
... autoguiding is fast/accurate but can include seeing errors if the rate is fast...
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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.