Archived posting to the Leica Users Group, 2000/11/08

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Subject: Re: DOF (was: RE: [Leica]Why a 35mm lens?)
From: Douglas Herr <telyt560@cswebmail.com>
Date: 8 Nov 2000 13:42:57 -0800

On Wed, 08 November 2000, "M.E.Berube" wrote:

> 
> At 09:44 AM 11/8/00 -0800, Douglas Herr wrote:
> >DOF has nothing to do with focal length.  DOF is influenced by image 
> >magnification and aperture.  Shorter lenses have greater DOF for a given 
> >aperture and working distance because of the reduced image magnification.
> 
> OK.
> Aren't lenses that are "Shorter" and have "reduced image magnification" 
> usually pretty much reciprocal with Wider Angle focal length lenses?
> (I'm honestly trying to gain new knowledge with this question.)
> 
> Carpe Luminem,
> Michael

Michael,

Wide-angle lenses are shorter than "normal" lenses and have reduced image magnification.

Doug Herr
Birdman of Sacramento
http://ourworld.compuserve.com/homepages/telyt
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