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1&2 Take a few shots around your home and check with a 18-55mm lens on. If that checks out grab your 80 and takes some shots of distance things, i think your focus er may have to much play if it gets to this stage. Work in the daylight and rule out one thing at a time, this way your taking the guess work out out of things. Check your T-ring and tighten the micro grub screws to and look for play between camera and scope.
3 Maybe its just drive problems, not an expert at all but is PEC enabled?
4 dust, oil from finger or could even be glue off gassing resiude, have your try'd a sensor swab ? Have you done any flats to check this out, may give a clear image of what it is.
Last edited by 2stroke; 06-05-2012 at 08:55 PM.
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