I am testing a 47mm XL, and it is driving me crazy. One side of the negative is sharp, but the other side seems to soft. I got a recessed board and repeated the test, to make sure that the bellows was not pushing the standards out of line, and got the same result. I cannot really make out where the transition is because it not dramatically soft, just less sharp. This lens has seen some wear and has a few dings, hence the serious testing before I commit to it. I suppose if the elements were knocked loose, they could be in place on one side and, pivoting on that edge, displaced on the other side. Does this make sense?
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