Whilst looking for information on the Nikon D7200 SDK I came across a Focus Calibration tool.
One of their FAQ comments is When a camera or lens leaves the factory, it has been set up to work as accurately as possible, but there is always some variation in the calibration. Modern DSLRs have a feature which allows adjustment of the autofocus to compensate for these variations, but it can be difficult to get right.
So what do others think?
Do you calibrate every new lens? Just when there may be a problem? Never?