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How to calibrate a lens


 use the ground glass to check focus



loosen the lens ring ( upper picture , loosen the two screws on each side of the lens ring first ), move the Barrel in or out ( clockwise or anti-clockwise ), focus to infinity using the ground glass . After finished,
tighen lens ring & retighten two screws.

 check focus ring, if it's not in correct place

take the front & rear elements of the lens out of the shutter, open all shutter blades

use tools to loosen the ring a bit

until you can move the infinity mark back

retighen the ring ensure that it's tight. This action won't influence the focusing distance.


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