Aperture control from the body was an evolutionary step in camera control. When Canon moved to the EOS, they were able to think about the most efficient way to control a camera, since they were no longer constrained by mechanical controls or convention. Their interface has been quite stable since then. To a great extent aperture rings on lenses are an anachronism and a concession to backwards compatibility. Both Pentax and Nikon put locks on their aperture ringed lenses so that they don't accidentally slip into their adjustable mode.
BR From: Bob Walkden <[EMAIL PROTECTED]> Duplication of user interface elements is almost always bad. Anytime a user interface designer finds him/herself putting 2 things on that do the same thing, they should stop and have a very good think about it.
