On a forum I read about a way to test your sensor for dust on your dSLR cameras using a 50mm or below lens. I decided to try it out and it worked out pretty well. Since this camera is fairly new and I do clean it and am a maniac when it comes to changing lenes in safe enviroments, its clean. Just like two specks of dust, but I haven’t even tested if that was from the lens. Anyway, test out your dSLR by viewing the instructions at the forums or here.