Archived posting to the Leica Users Group, 1998/05/24

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Subject: Re: [Leica] Fast M6 Focusing - Was Something Else!
From: Dennis Painter <dwp@deltanet.com>
Date: Sun, 24 May 1998 14:52:44 -0700
 
TEAShea wrote:
> 
> <<
>  Even if you have a 25 foot zone of apparent focus, there is still only a
>  sliver  of that zone that is in perfect, super sharp focus, right? >>
> 
> Correct - There is only one plane that is in perfect focus.  In front and
> behind that plane is an area of "accceptable focus" - which means that it is
> out of focus but by an amount that is acceptable.  Of course the question is
> what is acceptable.
> 
> Tom Shea

Tom, 

If the eye cannot discern the difference it is 'acceptable'  The amount
of enlargement and viewing distance are the factors in the ability of
the eye to discern differences.

Dennis


- -- 
Experience is a tough teacher. It gives the test before the lesson.
- -unknown