Unfortunately, image magnification has to do with the viewing image, not the negative image. But everybody talks about DOF on the film (or sensor now-a-days). Ratio of object size to viewing image size (magnification), and aperture diameter (not f-stop) determine DOF. An 8x10 from a 35mm camera with a 50mm lens and a 1 inch aperture has exactly the same DOF as a 4x5 camera with a 200mm lens and a 1 inch aperture does from a 4x5 camera. The smart ones out there will realize that a one inch aperture is f2 on a 50mm and f8 on a 200mm, but that is actually irrelevant when calculating DOF.
Ciao, Graywolf http://pages.prodigy.net/graywolfphoto ----- Original Message ----- From: "Raimo Korhonen" <[EMAIL PROTECTED]> > No. DOF is a function of image magnification and obviously a 112 mm lens gives more magnification than a 22.8 mm lens.
