Hi All - I recently came across a great deal locally on a Panny Leica 25. Tried it out on my EPL2 and pictures are gorgeous, however, when I look through the lens, there seems to be a dust fiber in one of the middle lenses (can't really tell, but definately not in the front or rear. It is not a desk spec, but rather looks like a really thing short hair - right smack in the middld of the lens. I took a number of shots and it doesn't seem a problem or show up in any of the pics. I am not as experienced as you guys, any concerns I have if I purchase this lens? Also, would this impact the resale value? Thanks!