Archived posting to the Leica Users Group, 1996/08/03

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To: leica-users@mejac.palo-alto.ca.us
Subject: Re: M3 Upgrade
From: TONY GALT <galta@GBMS01.UWGB.EDU>
Date: Sat, 03 Aug 1996 22:27:31 -0500 (CDT)

My M3 has such notches. I am surprised that yours doesn't, because the 
references I have say that the notches were standard on the M2 and M3. 
Basically when the split images of a particular focusing target in the 
rangefinder spot are no further apart than the width of the top notch
that object will be in focus if the lens (presumably a 50 mm) is set at 
f/16. The width of the bottom notch shows depth of field for f/5.6. I 
wonder if this is a feature added to M2 and M3 Leicas after they began 
being produced. I have found these notches to be a useful feature, but I 
believe they were dropped on later models (with which I haven't much 
experience). I wonder why.

Tony Galt
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Editor H-SAE (Discussion Group for the Anthropology of Europe)
Professor of Anthropology and Social Change and Development
College of Community Sciences
University of Wisconsin -- Green Bay 54311-7001
Green Bay, WI 54311-7001 USA
Telephone: 414-465-2349/2355
Fax: 414-465-2791
E-mail: GALTA@UWGB.EDU
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On Sat, 3 Aug 1996 Afterswift@aol.com wrote:

> When I returned my M3 to Leica for a cleaning about 15 years ago,
> particularly since it was loosening up and fungus got into the rangefinder
> optics, Leica NJ replaced the rangefinder optics with an updated design I
> never saw on another Leica. The rangefinder spot had extensions on the top
> and bottom of the rectangle as if to call the user's attention to the center
> of the area. Does anyone have a Leica with that configuration. I was told
> that it can indicate some focus information. 
> 
> Bob Rosen 
> 

In reply to: Message from Afterswift@aol.com (M3 Upgrade)