CL lens compatibility

Any collapsible lens will damage the meter arm if you collapse the lens. Obviously, you can use one safely if you trust yourself to always remember and not to collapse the lens. Leica stated back in the day when you could purchase "Dymo" plastic label tape, that you must wrap a piece of the tape (it had to be a 9.5mm wide version of the tape) around the outer part of the lens barrel (the part that the lens head slides down on) just under the lens head.
 
The rear element of the 35/3.5 Elmar does not go very far into the camera. I would not want to try a J-12. I had the Nikkor 3.5cm F3.5 in LTM, which is a copy of the Elmar. It would have been fine. I use a Canon 35/2 or 35/2.8 on my CL. The rear element of my 35/2.8 Summaron would not be a problem for the CL, but the goggles for the M3 are.
 
Any collapsible lens will damage the meter arm if you collapse the lens. Obviously, you can use one safely if you trust yourself to always remember and not to collapse the lens. Leica stated back in the day when you could purchase "Dymo" plastic label tape, that you must wrap a piece of the tape (it had to be a 9.5mm wide version of the tape) around the outer part of the lens barrel (the part that the lens head slides down on) just under the lens head.

I've used a collapsible Industar on my CL. The lens will collapse up to a point. It does not hit the metering arm at all, since it is stopped by a metal frame in front of the shutter. Just look at my avatar.

Clarence
 
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