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+1 for what Merlin said Adam as worth trying - they are fairly thin and its not too hard for one or more of them to be twisted - especially if you have been playing with the location of your assembly for the secondary. Tightning the outside screws on the OTA can be enough to twist them a bit. You can it very close by eye looking from the front of the scope.
Just checking - its just a single exposure, not a stack of images?
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