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From: kar@ritcv.UUCP (Kenneth A. Reek)
Newsgroups: net.rec.photo
Subject: Re: lenses are sharpest at medium aperture
Message-ID: <1087@ritcv.UUCP>
Date: Tue, 12-Jun-84 09:59:48 EDT
Article-I.D.: ritcv.1087
Posted: Tue Jun 12 09:59:48 1984
Date-Received: Wed, 13-Jun-84 02:03:57 EDT
References: <697@decwrl.UUCP>, <287@tpvax.fluke.UUCP>, <2633@watcgl.UUCP> <757@hammer.UUCP>
Organization: Rochester Institute of Technology, Rochester, NY
Lines: 10

Try this if you have a grain focuser in your darkroom (aerial image variety
please, not the ones that project onto a ground glass or other screen).
Look at the grain while you adjust the aperature of your enlarging lens and
you will see that at very small aperatures the grains get fuzzy.  Large
enlargement and unbearably grainy film like Tri-X help this to show up
better.  By the way, I've seen this through my EL-Nikkor 50mm lens whose
optimum aperature is around f5.6.
-- 
	Ken Reek, Rochester Institute of Technology
	{allegra,seismo}!rochester!ritcv!kar