Archived posting to the Leica Users Group, 1997/12/05

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Subject: Re: [Leica] Only two diffraction limited lens?
From: Eric Welch <>
Date: Fri, 05 Dec 1997 18:29:10 -0600

At 09:35 AM 12/5/97 -0500, you wrote:
>At 11:00 PM 12/3/97 -0600, Eric Welch wrote:
>>As far as I know, Leica has only two diffraction-limited lenses. So 
>>good are those numbers?
>Uh , I was under the impression that all lenses are diffraction 
>limited.   A matter of physics as I remember. The reason many 

I don't think so. Seems to me diffraction limited is when the lens has
optimum aperture wide open, and that stopping down only degrades the image
because of diffraction. 

But like you, I've been known to be wrong more than once.

Eric Welch
St. Joseph, MO

The gene pool could use a little chlorine.