Archived posting to the Leica Users Group, 1996/09/13

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To: leica-users@mejac.palo-alto.ca.us
Subject: Re: numbers on Summicron focusing ring, again
From: Thomas Knoles <tgk@mwa.org>
Date: Fri, 13 Sep 1996 08:58:33 -0400 (EDT)
 

Thanks to those who explained the "22" on my Summicron focusing ring.  
Now, my next question.  My black 50mm Summicron, which is #3,618,xxx, is 
engraved with a "22," but in Eastland's _Leica M Compendium_ there is a 
photo of a chrome specimen serial number 3,606,xxx which is engraved 
"19."  

Why would the actual focal lengths of these two lenses be different when 
they were presumably manufactured within a couple of years of each other? 
Wouldn't this need to be due to a change in the design of the lens?? 

Thanks for any input on this,

Tom Knoles
tgk@mwa.org