My Sigma 90mm f2.8 macro has a fault. The front portion of the lens, which is
supposed to go in and out without rotating, now rotates. This can happen when
I inadvertently grip it while turning the focus ring or sometimes when I don't.
Infinity focus is then thrown out. To focus on infinity I have to turn the
front of the lens back to the right position. Would anybody happen to know if
there is a DIY fix?
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