I am looking to get a Canon DSLR in the next year or so. I currently own several Canon EF lenses which I use with my film SLR. I was told that when I used these lenses on a dslr, the focal lengths are actually 1.6x the listed length (i.e. 50mm on a film camera = 80mm on a digital). Is this true? How does this affect shutter speeds? I know the rule of thumb is 1/focal length as the appropriate shutter speed for a sharp image. So if I use a 50mm lens which is now 80 mm on a digital do I now need a shutter speed of 1/90? Thanks for any help provided.