Archived posting to the Leica Users Group, 2008/12/13

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Subject: [Leica] Re: Summaron: a very long post about a small lens.
From: marcsmall at comcast.net (Marc James Small)
Date: Sat Dec 13 10:03:57 2008
References: <200812130331.mBD3VQoT089665@server1.waverley.reid.org> <A3B2C7B3-4107-4F30-A014-39B9943526A6@optonline.net>
 
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!
Replies: Reply from hlritter at bex.net (Howard Ritter) ([Leica] Re: Summaron: a very long post about a small lens.)
 In reply to: Message from lrzeitlin at optonline.net (Lawrence Zeitlin) ([Leica] Re: Summaron: a very long post about a small lens.)