Archived posting to the Leica Users Group, 2008/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 12:05 PM 12/13/2008, Lawrence Zeitlin wrote: > >I simply quoted Emil Keller's book. He was there. None of use were. >He specifically mentions the lens as an f3.5 Summaron although he >does err in stating that the diaphragm modification added a full stop >instead of half a stop. Larry With respect, it is a third of a stop, not a half-stop. The European apertures are 1/3 of a stop different from the International scale which has been the norm since the 1950's. Marc msmall@aya.yale.edu Cha robh b?s fir gun ghr?s fir!