Archived posting to the Leica Users Group, 1997/02/26

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Subject: Re: making pictures with the M leica
Date: Wed, 26 Feb 1997 13:12:28 +0100

>   You should only focus in one direction with any camera especially an SLR. 
>     You begin with the image completely out of focus,then turn the lens in 
>   one direction until it is sharp and then stop immediately.  The reason 
>   that this is important is that the eye will try to make a slightly out of 
>   focus image appear in focus if it is exposed to it long enough, this 
>   process is called accomodation.  

>   SO this is good advice but it shoud be applied with all focusable 
>   cameras.

>   HTH
>   John

The human eye can accomodate to different distances. With an SLR the distance
is constant, i.e. it is the (virtual) distance to the ground glass. You see in
the same distance that it sharp or not.