Archived posting to the Leica Users Group, 2001/01/11

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Subject: Re: [Leica] 50 Summicron-R
From: Vick Ko <>
Date: Thu, 11 Jan 2001 21:41:06 -0500
References: <>

What's the first cam?  Or are there 2 "second ramped" cams,
which make up cams #1 and #2, and the stepped thing is
cam #3?


Doug Herr wrote:

> On Thu, 11 January 2001, "Randy Andrade" wrote:
> >
> <SNIP>
> > How can I tell the difference between a 2-cam and 3-cam Summicron-R?
> > Looking at the rear of all the lenses I have, I cannot tell the
> > difference...perhaps all I have are 2-cam, or they may all be 3-cam lenses.
> > But how can I be sure?  I recognize the two silver proturbances with one end
> > higher than the other (the cams on opposite sides of the rear element), and
> > the aperture control lever between these two cams at the same radius from
> > the center.  But where is the 3'rd cam?  Can anyone enlighten me.  This is
> > the problem with having both an SL and an R-series camera, and then
> > forgetting which lens was for which camera.  Please help this poor memory
> > impaired person?
> > Thanks for the help in advance.
> > Randy
> Randy,
> The 3rd cam is a stepped thingie next to the "inboard" side of the 2nd cam.  The 2nd cam is the one that is at the bottom of the lens mount when the lens is on the camera.
> One easy way to tell if a lens was originally built with the 3rd cam is the focal length engraving in orange next to the DOF scales - if it has this marking, it was originally built with the 3rd cam.  If it doesn't have this marking it may or may not have the 3rd cam and you have to look at the cams to be sure.
> Doug Herr
> Birdman of Sacramento
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In reply to: Message from Doug Herr <> (Re: [Leica] 50 Summicron-R)