Okay, somehow I managed to get a partial thumb print (I would be busted for sure if a crime was involved) on the rear element of my Oly 12mm. After a few f-bombs were dropped, I carefully cleaned the element with a microfiber cloth and a drop or two of Nikon lens cleaning solution. Now, if I look carefully in the right light, I can see a couple very tiny nicks on what appears to be the coating of the element. I am considering selling this lens (I have already have the 14/2.5 for a walk-around) to help fund a DSLR for landscapes. My question is whether I should send this back to Oly to get the rear element replaced, or just discount accordingly when I sell (and what would be an appropriate discount)?