ironringer Posted February 9, 2014 Share #1  Posted February 9, 2014 Advertisement (gone after registration) Could M240 users please advise which LTM-to-M adapter ring(s) are best for using 1950s screwmount lenses (Elmar and Summitar 5 cm with infinity lock button, and Summicron 50 mm) on the M240? Yesterday (in order to test these old lenses, with digital files results instead of testing with film on my IIIf) I asked a friend to try using my 1950 Elmar (pictures attached), with a Leica M adapter ring (picture attached, 2.8 and 5 cm version). It would not work - the M240 screen said "no lens attached". Some websites (including this Forum, historical section) suggest that the edge-rim cutaway on the old Leica adapter rings does not cover the M240 body sensor, leaving it open (so the camera probably thinks there is no lens attached). Q1: What different adapter rings should be used, to use the 1950s screwmount lenses with an M240? OR, Q2: is there a workaround setting in the M240 camera, to effectively ignore the sensor (that does not see a lens rim with codes) and proceed to use the old lens with the old adapter ring? All suggestions are appreciated, thank you. 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! 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/221803-which-m-adapter-for-using-1950s-ltm-lenses-on-m240/?do=findComment&comment=2529221'>More sharing options...
Advertisement Posted February 9, 2014 Posted February 9, 2014 Hi ironringer, Take a look here Which M adapter for using 1950s LTM lenses on M240?. I'm sure you'll find what you were looking for!
jaapv Posted February 9, 2014 Share #2 Â Posted February 9, 2014 The only workaround is a piece of white sticky paper or similar. Link to post Share on other sites More sharing options...
250swb Posted February 9, 2014 Share #3 Â Posted February 9, 2014 The simple way to do it is get a codable adapter with the rebates cut into the flange. Put 'LTM' into an EBay search and one will come up. Get one for a 50mm lens, and code it using matt black hobby paint for the nearest equivalent to your 3.5 Elmar. You can then leave the camera set to 'auto detect' with all your other lenses. Â Steve Link to post Share on other sites More sharing options...
jdlaing Posted February 10, 2014 Share #4 Â Posted February 10, 2014 This kind. The ones without the cutout. Â Voigtlander M-Bayonet Adapter Ring for 50/75mm 45BD209A B&H Link to post Share on other sites More sharing options...
TomB_tx Posted February 10, 2014 Share #5  Posted February 10, 2014 While the ones without the cutout are needed for coding, the infinity lock on the LTM Elmar will hit the adapter and will cause problems. The Summitar and Summicron have a deeper rear flange and should work OK with the codable adapters (no cutout). Screw a 50 Elmar (or 35 Elmar/Summaron) on a codable adapter and the non-cutout flange will prevent the infinity lock from releasing - so you can't focus, or can't go back to infinity if it was focused closer before attaching. 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! That's why Leitz added the cutout - so the infinity lock on these lenses would have clearance to release: Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! That's why Leitz added the cutout - so the infinity lock on these lenses would have clearance to release: ' data-webShareUrl='https://www.l-camera-forum.com/topic/221803-which-m-adapter-for-using-1950s-ltm-lenses-on-m240/?do=findComment&comment=2529299'>More sharing options...
ironringer Posted February 11, 2014 Author Share #6 Â Posted February 11, 2014 While the ones without the cutout are needed for coding, the infinity lock on the LTM Elmar will hit the adapter and will cause problems. The Summitar and Summicron have a deeper rear flange and should work OK with the codable adapters (no cutout).Screw a 50 Elmar (or 35 Elmar/Summaron) on a codable adapter and the non-cutout flange will prevent the infinity lock from releasing - so you can't focus, or can't go back to infinity if it was focused closer before attaching. [ATTACH]422010[/ATTACH] That's why Leitz added the cutout - so the infinity lock on these lenses would have clearance to release: [ATTACH]422011[/ATTACH] Â Thank you TomB_tx and other advisors for the explanation. I should have tried this (with my 2.8 & 5 cm adapter ring and Elmar 5cm) to experience the interference that your pictures show clearly. I understand that the Voightlander adapter without cutout would allow coding-marks to be added, and afterward a screwmount lens could function with the M240, IF its infinity lock button did not hit the rim of the adapter. Has anyone tried taping (delicately) a piece of dark paper over the M240 sensor area, to fool it into knowing there is a lens mounted? Link to post Share on other sites More sharing options...
ironringer Posted February 12, 2014 Author Share #7  Posted February 12, 2014 Advertisement (gone after registration) The simple way to do it is get a codable adapter with the rebates cut into the flange. Put 'LTM' into an EBay search and one will come up. Get one for a 50mm lens, and code it using matt black hobby paint for the nearest equivalent to your 3.5 Elmar. You can then leave the camera set to 'auto detect' with all your other lenses. Steve  Further to the use of M adapter rings ... the Pocket Leica Book (1955) by Theo Kisselbach refers to a tool (maybe the adapter's plastic container itself?) made for removing M adapter rings from the M body. Has anyone seen this tool, which probably has 3 semi-circular "fingers" that fit into the 3 rim cutouts on 1950s M adapter rings? Can someone share a picture of it? This would be be a very useful device, and I do not see anything like it on Leica websites or on eBay. Link to post Share on other sites More sharing options...
TomB_tx Posted February 12, 2014 Share #8 Â Posted February 12, 2014 Further to the use of M adapter rings ... the Pocket Leica Book (1955) by Theo Kisselbach refers to a tool (maybe the adapter's plastic container itself?) made for removing M adapter rings from the M body. Has anyone seen this tool, which probably has 3 semi-circular "fingers" that fit into the 3 rim cutouts on 1950s M adapter rings? Can someone share a picture of it? This would be be a very useful device, and I do not see anything like it on Leica websites or on eBay. The Voigtlander rear caps for M lenses have the three nubs to remove the adapters, as did the older Leica rear caps. (But the newer Leica caps do not.) Link to post Share on other sites More sharing options...
microview Posted February 13, 2014 Share #9  Posted February 13, 2014 And the Voigtländer LTM adapter comes with a cap with the studs as described above. Link to post Share on other sites More sharing options...
jaques Posted February 13, 2014 Share #10  Posted February 13, 2014 and some old (bakelite?) leica lens caps do as well  I am quite annoyed- I have a collected over time many LTM/M adapters- all original Leica ones and for all focal length options- even a modified one for my 50mm collapsible elmar (you can easily remove a bit of the edge so the infinity lock doesn't get in the way) and now they are all quite useless on the M. If only they had put an option to turn off/disable the lens coding sensor it would not be necessary for me to go out and spend hundreds of dollars on new adapters. Given that Leica must have been/or should have been aware of this issue I think it is a shame they didn't take it into account. Link to post Share on other sites More sharing options...
philcycles Posted February 14, 2014 Share #11 Â Posted February 14, 2014 The camera will take pictures just fine with the Leica adapter, just no live view etc. Use the rangefinder, take the picture, no problem. Just like the old days. Phil Brown Link to post Share on other sites More sharing options...
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