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I would do some more testing to confirm the behaviour, testing on the VM-E to see if I can duplicate the results, testing on the TAP to see if it is field curvature/focusing distance, alignment with the wall(also at infinity) and on a tripod to reduce any variance in technique, and I also agree with using manual focus, a calliper or micrometer will be useful to rule out adapter uniformity, even shooting the camera upside-down may yield useful data, nothing like throwing money at user error(not that that's what's happening).
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