Archived posting to the Leica Users Group, 1998/05/24

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Subject: Re: [Leica] sharpness discussion
From: Chris Bitmead <chrisb@ans.com.au>
Date: Mon, 25 May 1998 04:43:30 +0000
 
Don Ferrario wrote:

> My un-educated guess is that since the SLR retrofocus
> lens must basically "straighten-out" the image so that
> the focal plane is moved back behind the mirror, the
> angle of convergence in the circle-of-confusion is different.
> It appears the circle-of-confusion is bigger (and thus
> less sharpness) in an SLR type lens, all other things

Are any Leica M lenses retrofocus? What about the 21mm?

Wasn't there a 15mm once upon a time? What about that one?