I was bored tonight and decided to play around with some water drops...put my 55-200 mm lens on and put my camera on the tripod. I turned on the camera and my lens won't focus. My 18-55 mm lens will focus just fine. I toggled the AF/MF switch a few times and wiped off the contacts with the same kind of cloth that I use to clean my lens (suggestions that I read online for ways to fix this issue). Still isn't working. I think my lens is still within warranty - I just purchased it in June. But I would prefer to get this fixed tonight if there's some way I can fix it myself. If not, any input on how you go about doing a warranty claim and your experience with doing them would be great. Any suggestions?! Thanks! ETA: It worked just fine when I was taking some photos of deer in my back yard just a couple nights ago and I haven't used it since. It's just been in my bag.