Hi, Folks, Through the years I have collected various cameras that use the Compur Deckel and Prontor-SVS interchangeable lens mounts, both in-body leaf-shutter lens mounts for 35mm film cameras. I have posted some shots of the cameras, the body mount, and the lens mount here: Deckel Mount: http://www.flickr.com/photos/yefeihe/sets/72157624475091295/ Prontor-SVS Mount: http://www.flickr.com/photos/yefeihe/sets/72157624599835910/ And a collection of Braun cameras which used both Deckel and Prontor-SVS in its product line: http://www.flickr.com/photos/yefeihe/sets/72157624599849332/ The Deckel mount actually has two types, one for rangefinders only, such as Braun Colorette and Voigtländer Vitessa T, which does not have auto-diaphragm mechanism, and one for both reflex and rangefinder cameras, which has the auto-diaphragm mechanism but sometimes without the rangefinder coupling cam when intended for reflex cameras. Among the latter, different camera makers shaped the lip on the mount in ever so delicately different ways to make them non-interchangeable across brands. Easily defeatable, of course. With the photos, maybe someone can come up with a universal pattern for the lip to turn it into a Retina-Bessamatic-Iloca-Braun Reflex-Edixa-Balda universal mount! I can only find two variations of the Prontor-SVS mount, one for the Braun Paxette Super III series and one for the King Regula series. No doubt Prontor wanted to compete against Compur, but wasn't very successful. There don't seem to be many Japanese makers of interchangeable in-body leaf-shutter rangefinder cameras. Aires 35-V, Minolta Super A, and Olympus Ace are the three I know. Interestingly Olympus claimed its camera was the first of its kind in Japan, but as far as I know, Minolta Super A came out in 1957, and Olympus Ace came out in 1958.