Archived posting to the Leica Users Group, 1997/06/01

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Subject: Re: M3 DOF in viewfinder?
From: Paul Schliesser <paulsc@eos.net>
Date: Mon, 2 Jun 97 00:17:26 -0400
 
>The diagram shows what appears to be the central rangefinder patch, with
>different size "notches" at the top and bottom of the patch.  From what
>I remember, the near and far limits of depth of field can be determined
>when the double image of a vertical object falls within these notches.

Dave,

This feature was actually introduced on the M2, and was later added to 
the M3, so early M3s lack the tabs.

They are little tabs on the top and bottom of the rangefinder patch 
itself, they are not on the framelines.

- - Paul