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 theinfinitymark
back
retighen the ring ensure that it's tight. This action won't influence the focusing distance.
use
the ground glass to check focus
