Help! I have dust spots on all of my pictures, taken during a recent trip with my Canon 20D. The spots are visible through the viewfinder, appear on my pictures and are not lens specific (they appear in the same place no matter which lens I use) I know this throws in the face of all logical thinking and this can't be true, i've tried to figure it out, I've cleaned the sensor, mirror, lens surfaces. I don't know what else to try! The spots are more pronounced when taken with a smaller aperture on a solid backgound. Any ideas?