Hey guys, last week received my brand new P100-300 and on saturday went "birding" to test it out. everything was perfect till i got home. Every time i go shooting and come back home I clean my gear, blower, wipes, etc. when i was cleaning the lens noticed a little tiny hair on the front element, i cleaned it, but it was still there, then i noticed that the hair was inside the lens. All of the images ive got from that day using that lens, were clean and that tiny hair doesn't affect my images so far, but what worries me is that I KNOW the lens is "open" somewhere in the body. and in the future could be a problem, the dealer is quite nice and of course is open to swap it for another copy, the problem with that is that i know how this "mid-class" lenses quality control is not that good and its almost a matter of luck getting a good or bad copy. And if i change it, im afraid of getting a faulty copy and what not. anyway. any suggestions on what to do?. keep it or change it?. all comments are more than welcome.