Hello. So I am currently on a road trip from New Jersey to Washington state, and then to Yellowstone National Park where I will be working for the summer. Yesterday I was taking some pictures in "The Badlands", SD and was having no problems. Though there was dust blowing around a lot. But I made sure to keep my lens cover on and to keep my camera safe (i thought). It still seemed fine when I left, but then we traveled to Mt. Rushmore. When I went to use my camera there I found that it was really hard to focus my camera. It still works, but requires much more force than it should to turn the focus. Is there anything I can do to clean/fix it? Thanks!! P.S. I will be posting my "good" road trip photos when i get to Yellowstone.