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Could you post a single sub for us to look at?
Polar alignment - polar misalignment will show up as field rotation around your guide star, was this the case, is your guide star round, and is there rotation about it?
Could you post a reasonably large out of focus star, which is centred as best you can in the midle of the chip? just enough exposure to show it up, but not to dim, maybe 10-20 sec or so.
Josh
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