Archived posting to the Leica Users Group, 2001/01/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]From the rear of the lens, two fixed (they don't move) metal ramp (sloped) cams, one on each side of the rear element (very prominent, can't miss them), the third cam is a square metal block (between the two ramp cams) that when you move it, it opens up the diaphragm. Two ramps and a movable square block. Jim At 03:02 PM 1/11/01 -0700, Randy Andrade wrote: >Hi folks, >Having lurked for a while, and having searched the archives, I am still >somewhat perplexed. Perhaps I'm just reaching my second childhood. In any >case, for me recently the burning question has been: >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