The lens elements are the same in all of them so performance is the same. Except for SWC with chrome lens barrels which do not have the T* multicoating. Models include Supreme Wide Angle and Super Wide 1954-59, SWC 1959-80, SWC/M modified to accept polaroid back 1980-81 with Synchro-Compur shutter, SWC/M with CF lens and Prontor shutter 1982-89, 903SWC 1989 until late 1990's. Last model 905SWC used different glass in the lens formula for environmental reasons. It was the lastest CFi lens design. All excellent cameras!