>> ... . Somebody, maybe Nikon, did, however, make a short focal >> length lens that required the locking-up of the mirror to allow the >> attachment of the lens to the body - meaning the SLR became a camera >> that required an auxiliary optical finder for use. > >Many of the fisheye models, at least; checking the Moose book shows at >least the 8mm f8, 7.5mm f5.6, 10mm f5.6, 6mm f5.6. The 6mm f2.8 and 8mm f2.8, >however, work with the mirror in place, and actually let you view the >image through the viewfinder! David, Right. That is what I meant ... the rule has been to make the wide angle lenses work with the mirror down allowing viewing through the lens. Did you find "the" exception to the rule I was trying to decide if anyone ever made and that is a wide angle lens for an SLR that required that the mirror be locked up? I really am not sure _anyone_ made such a beast but maybe. I know Canon made a 38mm that could only be used on the Pellix since it's mirror does not move and thus has smaller space requirements. But I am trying to identify a 21 or a 24 or something that would require mirror lock-up. cheers, andy
