Archived posting to the Leica Users Group, 2001/02/11

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Subject: Re: [Leica] DOF: Erwin
From: "Tim Spragens" <info@borderless-photos.com>
Date: Sun, 11 Feb 2001 20:14:53 +0100
References: <007b01c09440$58cfb900$273334d1@default>
 
On 10 Feb 2001, at 11:29, Shan wrote:

> then 
> placing the lens exactly between these two points per references on
> the focusing track, then selecting the appropriate f/stop to cover it,
> i.e. 1/2 in front...1/2 behind. 

But focus isn't linear WRT the position on the rack. If you move the 
lens mount to halfway between your focus for near and far 
distance, you aren't focussing on a point midway between the 
objects, no?
In reply to: Message from "Jacques Bilinski" <jbilin@axionet.com> (Re: [Leica] DOF: Erwin)