I bought it used off POTN from a fairly reputable guy. I just got it in (at work) so I checked it over. Both sides of the lens were a 4 out of 10 on the dirty scale so I brushed them off with my lens pen. After all the dust was off I noticed there are three specs on the lens. They are small but I can see them. Using the other side of the lens pen I tried to get them off but no luck. I took some quick test snaps and didnt notice but all i had was a white wall. There was a filter over the lens but it too his a larger, darker thing of mook on it that the lens pens couldnt fix. I'm not too sure what I should do. I've already emailed the guy I bought it from letting him know the situation. Im pretty sure there's nothing to do about the filter, but I can't believe he didnt notice this before. Any thoughts? The lens is frikken sweet, I'm excited to use it, but if i need to send it back I wnat to do it asap and find a different one.