This is a low-tech question. I just bought a used AIS 105/2.5 -- and there is a dead insect between the elements, towards the edge of the glass. Doesn't seem to affect anything: the lens is super sharp, and I'm seeing no flare (and the bug's too far from the focal plane to appear in the image). BUT: Is this likely to lead to fungus? I'm in Mexico, so it's not trivial getting a lens CLA'd -- but I will if it's crucial.