The mirror angle and distance does not change the lens to focus screen distance
very much. There are shims under the holder for the focusing screen that adjust
the screen-lens distance. But before sending the camera in to be adjusted I
would take out the focusing screen and clean the edges and also clean the upper
surface where the screen fits in the mirror box. It takes very little to change
the focusing distance. Also, unless the focusing distance was incorrectly set
up in the first place, there is little that one could do to upset this
adjustment. Even if the lens flange to film plane distance were changed by some
type of impact, this would not necessarily change the lens flange to focusing
screen distance.
Warren
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