Archived posting to the Leica Users Group, 1998/05/01

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Subject: Re: [Leica] Leica lenses stopped down below 5.6
From: LRZeitlin <LRZeitlin@aol.com>
Date: Fri, 1 May 1998 18:45:12 EDT
 
Hard as it is to believe, a theoretically perfect lens is at its sharpest wide
open. The reasons are hard to explain but if you really must know why, consult
a good textbook on photographic optics.