I have a Nikon D50, and I've recently been trying my hand at HDR photography. I've noticed that there seems to be dirt somewhere in my camera, since every HDR has dots in the same place in each photo. Here is one for an example: http://picasaweb.google.com/mikejrisi/NewHDR/photo#5185223838494517586 I looked closely on both ends of the lens, and on the CCD itself, but I can't see anything. Is it possible to tell where the dirt is by looking at the photos? Thanks everyone.