Archived posting to the Leica Users Group, 2000/07/23

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Subject: Re: [Leica] Diffraction limited; bo-ke
From: Mark Rabiner <mark@rabiner.cncoffice.com>
Date: Sun, 23 Jul 2000 12:21:31 -0700
References: <B5A07FD7.BC30%chrislee@mac.com> <000d01bff4ef$d3a48980$e0ef1c18@triad.rr.com>
 
><Snip> 
> > Diffraction-limited is a very specific term that is used to describe a
> very
> > small group of lenses where the optical aberration is so well corrected
> that
> > the only (internal) source of image degradation is diffraction.
><Snip> 
The point though being that you don't routinely stop them down a few to take out
the "impurities" in the image.
You ONLY stop down when you need the depth of field.
Mark Rabiner
Replies: Reply from "Dan Post" <dpost@triad.rr.com> (Re: [Leica] Diffraction limited; bo-ke)
 In reply to: Message from Chris Lee <chrislee@mac.com> (Re: [Leica] Diffraction limited; bo-ke)
Message from "Dan Post" <dpost@triad.rr.com> (Re: [Leica] Diffraction limited; bo-ke)