Archived posting to the Leica Users Group, 1997/12/04

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Subject: Re: [Leica] RE: soft focus vs out -of- focus in an ultimate sharpness world
From: Steve Echols <steve@mvillage.com>
Date: Thu, 4 Dec 1997 07:01:43 -0600
 
>
>So please, define what diffraction limted means. Seems to me these numbers
>don't make sense.
>==========
>
>Eric Welch
>St. Joseph, MO
>http://www.ponyexpress.net/~ewelch
>
Does the rule of thumb of 1/5 the focal length as being the smallest f stop
to use without having diffraction problems work?
Steve