I am trying to figure out if there is a benefit to this arrangement as we find on the Kodak Retina IIc, IIIc, IIC, IIIC, and some SLRs such as Contaflex
. It seems counter intuitive, since the rear fixed lens dictates how the front lenses have to be, and requires that the front lenses be floating.
Floating front lenses, from the evolution of the twin lens reflex, seem to be something you would want to get away from.
Maybe there is something I am not getting. Another reason I am curious, is that there is a need for fixed body lenses for diminishing digital formats -- pretty soon the tiniest sensors may be as good as the large ones.