i think you have to call these something different, out of focus is a different issue, a lens is designed to focus at a set back distance for its type, a broken or mis-performing lens is not this issue this issue is about the mirror whether other problems can be solved by the same solution does not make them the same problem as it may not appear on two different cameras where as a lens fault would and it would not affect resale as its a natural phenomenon of SLR camerasIt can also be a lens issue, specifically if the AF motor doesn't move exactly the amount the camera tells it to, particularly in high speed shooting modes when the camera might not do a "confirmation" AF reading after the lens has moved. It can also be a loose lens/camera interface that allows the lens to move slightly in relation to the sensor after AF has been locked.
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