Ok. I understood that the digital lenses were optimized for use with a digital sensor but I also thought they were made to correct for the "crop factor". For example, my 20D with a 50mm lens with it's 1.6x crop factor would produce the same image size as a 35mm film camera with an 80mm lens. Do the digital lenses not correct for that so that there is no need to correct the focal length of the lens by multiplying by 1.6?