[Leica] R lenses on the M

[tomschofield at comcast.net (Tom Schofield)]

Actually, I think 2cam vs. 3 cam isn't the issue.  There are two lens mount 
variations which come in to play.  Third Cam lenses, which do not have the 
first two SL cams, have a ridge all the way around the lens mount that keeps 
it from being mounted on a camera that requires those first two cams.  (e.g. 
I had a 60mm R-cam lens that would not mount on an early SL bellows, so I 
sold it and bought a 3-cam version.)  The second variation is that the upper 
bayonet claw on an R or SL2 body is shorter than the corresponding claw on 
an SL.  This  allows some superwides which would interfere with the SL 
mirror, to mount on an SL2 but not an SL.  The mirror swing was one of the 
main differences between the SL2 and SL.  It is probably grinding down that 
upper claw to make it match the SL2, that they were referring to on Nemeg.

So, in addition to there being 1 cam, 2 cam, 3 cam, 3d cam and ROM mounts, 
you should add SL and non-SL compatible variations of the 2 cam and 3 cam 
lenses, for a total of 7 different Leica  reflex lens mount variations!

Which gets back to it being cheaper and easier to buy Adorama's Flashpoint 
brand R to M adapter, which I can tell you from experience, does work for 
mounting Leica R 3-cam superwides on an M.  (To verify the above, I looked, 
and the upper claw on the Adorama adapter does match the SL2 rather than the 
SL.) 

Doug, oh great R guru, do you have further enlightenment?

Tom (spending waaaay too much time figuring out this post!)  



On Sep 28, 2010, at 6:23 PM, Vick Ko <vick.ko at sympatico.ca> wrote:

> 
> I read on the nemeg site that you need to grind away some metal.  So, I 
> won't be buying a 22228
> 
> 
> ...Vick
> 
> On 9/28/2010 9:19 PM, Dennis Kushner wrote:
>> 22228  is for 2 cam R lenses. Can this be upgraded to 3 cam?
>> 
>> Dennis
> 
> 
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