Archived posting to the Leica Users Group, 2003/08/27

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Subject: diffraction (was Re: [Leica] Leica 90mm f/4.0 Elmar C prices)
From: Doug Herr <telyt@earthlink.net>
Date: Wed, 27 Aug 2003 03:21:24 -0700

on 8/27/03 12:56 AM, Afterswift@aol.com at Afterswift@aol.com wrote:

> ... isn't it possible to design a lens system in which
> successive lens elements correct for the diffraction produced by the initial
> small entry aperture. That is, the scattered light rays are recombined and
> refocused as though a wider aperture lens had been used?
> 

No.  You may as well try to re-focus light scattered from a frosted
diffuser, and you'll have the same success, i.e., none.

Doug Herr
Birdman of Sacramento
http://www.wildlightphoto.com


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