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I read from CN that QSI has a backward definition of “back focus” which often causes confusion. The adjustments in the table is meant to be made to the optical length of the camera. Therefore, if you add a filter you make a negative adjustment to the optical length, which in effect means you need a longer adaptor to make up for it. I can’t find the thread on CN now but it seems to be a recurring question posted on CN from time to time.
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