Andrew Palmer wrote:
>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?
>
>
You might roll back the rubber cover of the focusing barrel. The are
often screws hidden under there. May just be one that sets infinity by
locking the barrel in rotational position has come loose.
Moose
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