Archived posting to the Leica Users Group, 1996/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> I have a question about an obscure lens mount adapter. It's a "Canon > Lens Mount Converter A". The store claims it's a converter from Canon > FD mount to Leica thread mount. If I were sure that this were true I > would buy it. > > I worry that the store may be mistaken, however. I have a piece of > documentation, namely Viewfinder (LHSA magazine) Vol. 28, No. 2, 2nd > quarter 1995, p. 35, showing a "Canon Lens Mount Converter B," which > is supposed to adapt any breech bayonet Canon lens to Leica thread > mount. Now, my understanding was that the difference between breech > bayonet and FD mounts was in the presence of an aperture coupling pin > (not important for a rangefinder) and the presence of a locking ring > on the lens (not the mount), but that the two systems are otherwise > interoperable. So why would there be two different "Canon Lens Mount > Converters" then? I have in front of me Carl Shipman's "How to Select and Use Canon SLR Cameras" published in 1977. On p. 85 it states, "Screw-type extension tubes require adapters on both ends to fit breech-lock mounts on Canon SLR lenses and camera bodies. Lens mount converter A fits on the camera body and accepts screw-in extension tubes, or even a screw mount lens from the rangefinder lens assortment. This converter itself adds 2.8mm of extension. At the front end of screw-type extension tubes, use lens mount converter B to accept Canon FD and FL-style lenses".