Archived posting to the Leica Users Group, 2005/10/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 11:43 AM 10/25/05 -0400, Benjamin Marks wrote: >> >> Anyone experienced focus problems wide open with a J-8 or other USSR >> glass? Rumor was that the roller cams in the USSR RFs were built to slightly >> different tolerances than the SM Leicas so that wide open and close up focus >> was a problem. Any anecdotes? This isn't so, Ben. There were problems in mounting Prewar FED lenses on LTM bodies and the reverse, but that was caused by the same problem which Canon was to have with the mount: true LTM is 39mm in diameter and the thread is 26 turns per inch Whitworth -- Leitz was a microscope company and Whitworth was long the standard thread used on microscopes -- while the Soviets and Canon simply churned out gear in what they THOUGHT was LTM 39mm by 1mm DIN. FED learned the truth during the War and Canon got it sorted out by the time of the Korean War. Now, Nikon did use a cam slope on its RF cameras different from that used on the Zeiss Ikon Contax progenitor. This can cause minor difficulties in focusing longer-focal-lenth lenses. Marc msmall@aya.yale.edu Cha robh b?s fir gun ghr?s fir! NEW FAX NUMBER: +540-343-8505