Adjusting lens infinity focus is easy: you just untighten 4 screws and
adjust the lens maximum focus angle in relation to the focus ring
maximum angle.
The location of these 4 screws varies from lens to lens, I know that on
an M 50mm 1.7 they are on the front of the lens, around the element
behind the black bezel ring, I believe other primes should be similar.
On the 70-210 F4.0 these screws are on the perimeter of the focus ring
below the rubber cover.
Jon M wrote:
http://jon.beigetower.org/photography/135infinityfocus.jpg
Taken out my front window, focused to infinity, the
power line and leaves on the far right are maybe 75
feet away. The hill in behind is maybe a quarter to a
half of a mile away. The tree sticking up on the hill
was center of the frame, so this is a top-right corner
crop.
Bought this lens last year from a PDML member, just
discovered this problem earlier this year while riding
a ferry and trying to use it to take pictures of
things on shore. So it may have been something I did
to it at some point, though I don't recall anything
happening to any of my equipment that could have
caused it.
How can I fix this lens, or am I better off replacing
it?
-Jon Myers
Cullowhee, NC
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