Archived posting to the Leica Users Group, 1998/01/14

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Subject: Re: [Leica] Summicron 50 mm question
From: Dave Richards <rchdp@worldnet.att.net>
Date: Wed, 14 Jan 1998 17:46:22 -0700
 
>Just bought a Summicron 50 mm today. It is a 1969-1979 model (second
>optical design). According to J. Eastlands Leica M Compendium there a two
>version of this lens, a 7 and a 6 elements design. Does any of you know
>what kind of lens mine is? Serial number is 2518961. 
>This book also states the differences this specimen and the current optical
>design so minute as to be of little consequence. Is this true? Erwin what
>are your findings?

According to Dennis Laney in the Leica Collector's Guide, your Summicron
was made in 1972.  That makes it a 'second design' lense with 6 elements
with one cemented pair.  the present 'third design' Summicrom-M also has
six elements with two cemented pairs

Hope this helps.

Dave