Archived posting to the Leica Users Group, 1998/04/02

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Subject: Re: [Leica] Early Canon LTM Lenses
From: Marco Grande <hektor73@yahoo.com>
Date: Thu, 2 Apr 1998 11:24:29 -0800 (PST)

SO indded the 50/1.5 appears to be an infringement on Zeiss, even if
not an exact copy. 

- ---Jim Bielecki <jbieleck@northland.lib.mi.us> wrote:
>
> 
> >I've looked at cross sections of Canon RF 50mm lenses.
> >Only the 50/1.5 (a lens with a bad reputation) looks like a Sonnar.
> >Their good lenses (50/1.4, 50/1.8) look like typical Gauss designs.
Of course the 50/3.5 is probably legit since the patents on the Tessar
had epired in 1927, when, surely by coincidence, Leitz introduced the
Elmar, insistnig that it was independently developed....


> >
> >Marco
> 
> 
> Peter Dechert states in his book that Canon didn't have the ability to
> produce lenses until 1944 which is when they acquired Daiwa Optical.
 The
> first "true" Canon normal lens was a tessar-based 50mm F3.5
introduced in
> 1946.  Canon's first Gauss-based design was a 50mm F2.0 introduced
in 1947.
> The 50mm F1.5 was based on the Zeiss Sonnar and is actually pretty
good.  I
> know, I have one.
> 
> 

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