Archived posting to the Leica Users Group, 1996/12/17

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Subject: Re: Summicron & Genealogy
From: "Michiel Fokkema" <mfokkema@pop3.worldaccess.nl>
Date: Tue, 17 Dec 1996 21:58:31 +0000
 
> The difference in optical formulation can be determined by comparing a
> collapsible to a non-collapsible version:  the rigid one is five or ten
> millimeters longer.  This has been a subject of hot debate, as Leica never
> discussed it, though they have different patent numbers -- I guess I should
> run down the patents and write this up for LHSA.
> 
> Marc
> 

Hello Marc,

I cheked it and (off course) you are right.
The front element is about 5mm closer to the filmplane compared to a 
summicron NF, but also the rear element is closer to the filmplane. 
Why wouldn't leica discuss this?

      Greetings,


                 Michiel.