Archived posting to the Leica Users Group, 2016/09/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Sat, 17 Sep 2016 Philippe <photo.philippe.amard at gmail.com>wrote: >Just remembered a conversation heard years ago between M enthusiasts here, they were debating on the actual FL of varied Leica 50mm - >and got out impressive differences between luxes, crons, elmars, etc >Anyone knows more about this? >Ph ============================================================================================================= In "Camera 35" magazine Oct/Nov 1961, Arthur Kramer wrote about how E. Leitz dealt with variations in focal length: "...variations in focal length, if they are to provide critical sharpness, must be compensated. Here's the astounding way in which Leitz accomplishes this. For every Leica lens there is a *series* of focusing mounts which contains the proper cam and thread pitch to provide accurate [RF] tacking. As many as 18 mounts are available for certain lenses. Focal length variations which fall outside or between the values for which mounts are available are rejected. In this way, tolerances come closer to approaching zero than in equipment where this is not done." -- Alan Alan Magayne-Roshak, Senior Photographer University of Wisconsin-Milwaukee Photo Services (Retired) UPAA Photographer of the Year 1978 UPAA Master of the Profession 2014 amr3 at uwm.edu http://gallery.leica-users.org/v/Alan+Magayne-Roshak/ "All the technique in the world doesn't compensate for an inability to notice. " - Elliott Erwitt