I've recently started doing timelapse clips using my Canon 60D and interval shots. Because this often involves pointing the camera at large areas of sky and using small apertures to obtain slow shutter speeds, dust bunnies have suddenly become very noticable - maybe ten or a dozen faint but obvious spots on each image. I searched the internet on how to assess the extent of the problem and discovered how to shoot an out-of-focus area of sky and then use auto-levels on the image to show up the spots. SHOCK! It looked like a passing car had run through a puddle of dirty water and showered my sen