> So now we all know that a 50mm lens is actually ANY focal length, 7.8mm, > 90mm or whatever and the old constraints that held back our creativity have > been blown away like old dust that dared settled on our new ipod® - we are > now free - go forth and rejoice! karl You can only scale down (in format size) not up because of the very real limitation of the size of the image circle formed by a lens. A Canon EOS lens designed for film (allows the wave portion of light through) has an image circle that covers the 35mm frame. A 100mm version of such a lens on an APS-C sensor camera truly becomes 160mm. On an 8x10 camera however it remains 100mm simply becasue there is no more usable image. A "digital" lens however (designed to allow only the particulate component of light to pass) is not constrained by the same laws of physics, only the laws of the marketplace. Go buy your iPod. Concentrate on taking photos and sharing them. Learn that it is the sharing that really counts after all. Bob
