So the first inside glass piece on the lens has some sort of bubble looking crack thing around the edge, about a centimeter wide and half centimeter tall. I am not sure how it got there, as I have never dropped, banged, or even mishandled the lens. It sits in my hard foam lined instrument case when not in use... It does not affect IQ at all, but I would like to get it fixed. Any rough idea how much this will cost?