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Hi Paul,
Forget PEC, dragging cables etc.
These will cause RA errors, resulting in elongated stars, but across the whole field and all in the same (RA) direction.
You have elongation in two directions, if it's elongation at all.
I suppose the easy way to tell is to take a shot deliberately out of focus and see the shape of the stars in the corners.
That's if you can get some clear sky...
Cheers
Stuart
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