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maybe also try an out-of-focus star test and make sure the collimation has not shifted. I imagine that there is a fine line between clamping the lens elements tightly enough and overdoing it to the point of pinching - maybe something is drifting around sightly in it's holder?.
However, I think that field rotation would still be be the most likely explanation
Last edited by Shiraz; 31-07-2016 at 10:08 AM.
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