Archived posting to the Leica Users Group, 1996/09/14

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Subject: Re: numbers on Summicron focusing ring, again
From: D Khong <>
Date: Sat, 14 Sep 1996 15:51:23 +0800 (SGT)

My 90 summicron has "05" engraved.  Should the actual focal length be 90.5mm
or 89.5mm?  There must be a simple way to decipher all these numbers.


At 10:16 PM 9/13/96 +0100, you wrote:
>checked my chrome 50mm Summicron #2,052,xxx,and that is engraved "19" 
>; 51.9mm I suppose.
>Reg Ronaldson