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While you're at it, it would be worth double-checking that you have your distance between the reducer and sensor correct. Not sure what the distance is for the WO .86 but I'm sure you can get it from their website or similar.
Having done that, have a look at how you achieve focus. Do you use a Bahtinov or the FWHM or HFD numbers in Maxim? Make sure you have achieved the best focus you can and have another look. I know these sound basic things and I'm probably teaching granny to suck eggs.
Peter
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