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When I first started reading this I immediately thought "collimation" then found its a refractor and the "diffraction spikes" change with eye position. If these spikes move when you rotate an eyepiece then suspect the eyepiece, if they move as you rotate your head around the optical axis then suspect your eyes. It may be that you have a mild form of astigmatism in your eyes?? Wouldn't hurt to have it checked out with an optometrist.
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