Archived posting to the Leica Users Group, 1999/09/05

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Subject: Re: [Leica] Retrofocus wide angle lenses
From: Mikiro <arbos@silva.net>
Date: Sun, 5 Sep 1999 19:12:57 +0200
 
At 3:51 PM +0200 4/9/99, Doug Richardson wrote:
snip
>Perhaps Leitz thought in neccessary to move to retrofocus in order to
>get the speed of 28mm lenses to f2.8.
snip

Hi, IMHO there seem to be a couple of reasons:
1) To allow TTL metering with an M6 (and future bodies)
2) To decrease vignetting.  Symmetrical designs are subject to the cos^4 rule.

Mikiro
Strasbourg