Archived posting to the Leica Users Group, 1999/09/02

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Subject: Re: [Leica] Comments on Russar 5,6/20 mm please....
From: Doug Herr <Telyt@compuserve.com>
Date: Thu, 2 Sep 1999 21:41:17 -0400

>>>
>Well, an example of gem of a retrofocus 21mm is the venerable Elmarit-M
21mm
>and Elmarit-M ASPH 21mm.  If you look at the configuration, these superb
>lenses are technically of Retrofocus or inverted telephoto design.
>
>24mm ASPH, and the current 28mm are also Retrofocus.

Sure.  I was speaking in general terms.  A designer can do more without the
constraint of non-retrofocus parameters, but there are always exceptionally
good designs.  The missing Erwin Puts and I have had some lengthy
discussions about these designs, but I still don't know why Leica chose to
use retrofocus designs for them.
<<<

If I'm recalling history correctly, it was to provide clearance for the
M5's meter arm.

Doug Herr
Sacramento
http://ourworld.compuserve.com/homepages/telyt