buckyfullerene Posted July 28, 2016 Share #1 Posted July 28, 2016 (edited) Advertisement (gone after registration) Hi, this Canon Serenar 100mm f/4 lens is not M39 (LTM) lens mount, like most are. It has four flanges, but no external threads. Is it M mount? Something for cinematography? Thanks! (non-Leica owner trying to get to the bottom of this mystery) Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Edited July 28, 2016 by buckyfullerene Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/262967-need-help-determining-a-canon-serenar-lens-mount/?do=findComment&comment=3086816'>More sharing options...
Advertisement Posted July 28, 2016 Posted July 28, 2016 Hi buckyfullerene, Take a look here Need help determining a Canon Serenar lens mount. I'm sure you'll find what you were looking for!
TomB_tx Posted July 28, 2016 Share #2 Posted July 28, 2016 In 1953 Canon began selling lenses with other mounts, while they were also phasing out the Serenar name. I don't see the 100 f4 listed as one of these, but the 100 f3.5 is so listed. Both Contax (and Nikon) and Exakta mounts are known, and I've seen reference to use on early Miranda. The pictures look more like an M mount, but not the usual LTM adapter. The lens has a linkage for rangefinder follower, which the above models would not need, and it looks too deeply recessed to be functional. Since the Serenars phased out before the Leica M3 was released, and since the M mount was tightly patented, Canon would not have attempted a conversion then. Perhaps a custom mount made by an outside technician. Quote Link to post Share on other sites More sharing options...
spydrxx Posted July 29, 2016 Share #3 Posted July 29, 2016 Does the mount unscrew from the body (ie is it an adapter on an LTM lens)? Quote Link to post Share on other sites More sharing options...
zeitz Posted July 29, 2016 Share #4 Posted July 29, 2016 It is definitely a Leica M adapter, but the machining does not look like it is made by Leica. You may have to use a Leica M body as a "wrench" to unscrew the lens from the adapter. I can see one hole in the adapter; there is probably another hole on the other side. These holes can be used with a lens ring wrench to remove the adapter if it is hard to remove from the Leica M body. The linkage for the rangefinder follower is at the closest distance position. Quote Link to post Share on other sites More sharing options...
buckyfullerene Posted July 29, 2016 Author Share #5 Posted July 29, 2016 (edited) Thanks for the feedback. I think you're right, Erfahrener, that it's an adapter, maybe a custom-made adapter. And yes, there's another hole on the opposite side. Do you think it might be functional as-is on an M-body? (I don't have one to test out). Edited July 29, 2016 by buckyfullerene Quote Link to post Share on other sites More sharing options...
spydrxx Posted July 29, 2016 Share #6 Posted July 29, 2016 If it is a Leica M adapter, I would think it would definitely be functional on an M body...otherwise why make it. Now whether it is the proper thickness for 100% accurate focusing is another matter. FWIW, all the Chinese ones I've picked up over the years work just fine as do the Leica ones. Quote Link to post Share on other sites More sharing options...
250swb Posted July 29, 2016 Share #7 Posted July 29, 2016 Advertisement (gone after registration) It doesn't appear to be capable of rangefinder focusing (no machined rebate in the flange for the focusing arm). Quote Link to post Share on other sites More sharing options...
TomB_tx Posted July 29, 2016 Share #8 Posted July 29, 2016 It doesn't appear to be capable of rangefinder focusing (no machined rebate in the flange for the focusing arm).That's right - without that cutout in the adapted mount the cameras roller arm could never reach the mating mechanism in the lens.If you can remove the adapter, and the lens is the more modern Canon compatible thread (very early Canon had different thread dimensions), you could just change to a proper LTM-M adapter. Quote Link to post Share on other sites More sharing options...
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