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Posting-Version: version B 2.10.1 6/24/83; site watcgl.UUCP
Path: utzoo!watmath!watcgl!dmmartindale
From: dmmartindale@watcgl.UUCP (Dave Martindale)
Newsgroups: net.rec.photo
Subject: Re: Caveat Reador
Message-ID: <2618@watcgl.UUCP>
Date: Sun, 27-May-84 22:14:30 EDT
Article-I.D.: watcgl.2618
Posted: Sun May 27 22:14:30 1984
Date-Received: Thu, 31-May-84 23:44:15 EDT
References: <440@clyde.UUCP>
Organization: U of Waterloo, Ontario
Lines: 11

The article being referred to said that for maximum sharpness, buy a normal
lens with a maximum aperture of f/2 or thereabouts.  The implication is that
f/1.4 or f/1.2 lenses aren't as sharp - which is generally true.
It did *not* say to use the lens at f/2 for maximum sharpness.

The article *did* say that minimum aprerture produces loss of sharpness
due to chromatic aberration, which is wrong.  The smallest apertures
are less sharp because of diffraction.  So the advice was right, but the
reason given was wrong.

	Dave Martindale