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Hi R,
Were you shooting in RAW mode or JPEG? There could be some in-camera sharpening going on if in JPEG mode. To help diagnose I would shoot an image with RAW+JPEG engaged and compare. You could RESET the camera to its default settings and try again. The only problem is waiting until night and good weather for stars. Perhaps as a test you could try a high contrast day scene with sharp white and bright edges and then zoom in to the max to look for any such aberrations.
Happy hunting.
Best
JA
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