Quote Originally Posted by Slixtiesix View Post
I think it can also stand for "central shutter", as opposed to "F" for "focal plane shutter".
Yes... central, between-the-lens, and/or leaf... but not Compur to the best of my recollection/knowledge and not related to the bayonet size. Maybe the meaning of C changed after the Compur-to-Prontor transition... IDK for sure. Anyway... this isn't really central to the discussion... more of a pedantic sidetrack.