Archived posting to the Leica Users Group, 2001/05/07

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Subject: [Leica] Re: Leica Users digest V19 #353 Diffraction
From: Alan Magayne-Roshak <amr3@csd.uwm.edu>
Date: Mon, 7 May 2001 15:14:54 -0500
 
I can't remember what book I saw this in, but it gave this advice on
diffraction for critical use:

To limit diffraction, use stop no smaller than focal length divided by 4.

examples:  20 mm @ f/4.5,  50 mm @ f/11,  100 mm @ f/22,  200 mm @ f/45.

I've never done any tests, but there it is, FWIW.

Alan M-R