Archived posting to the Leica Users Group, 1999/07/09

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Subject: Re: [Leica] Re: DOF?
From: Peter Sundstedt <peter.sundstedt@swipnet.se>
Date: Fri, 09 Jul 1999 21:18:40 +0200

I have to disagree. The greater the spherical or chromatic aberration,
the larger the acceptable coc, so a greater percieved DOF. Since Leica
glass is well corrected in these aspects, it is nothing to worry about.

Jim Brick wrote:
> 
> Every lens, except some zooms and I think the Tri-Elmar, has DOF info, for
> that lens, engraved on the lens itself. The instruction booklet or most
> photo texts also tell how to read this engraved scale. Aberrations aren't
> involved. Lenses of the same focal length and at the same f/stop, at the
> same distance, have the same DOF.
> 
> Jim
> 
> At 10:11 AM 7/9/99 -0700, you wrote:
> >Mikiro Mori wrote:
> >><snip>
> >> I am beginning to understand better....@@;
> >> So, DOF is calculated on the assumption that the lens has no abberations.
> >> That's why we sometimes feel that lenses with the same focal length and f
> >> stop (but with different abberations) give apparently different DOFs.
> >>
> >> Mikiro
> >