Archived posting to the Leica Users Group, 1996/08/02

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Subject: Re: MR4 meters
From: "C.M. Fortunko" <>
Date: Fri, 02 Aug 1996 08:04:38 -0600


I very much doubt that active regulators are provided inside the MR4 meter.

I don't have an SL, but have an SL2. This camera does not have any
regulation. I would strongly advise you not to listen to store clerks and
other "experts" who say that the new batteries, like the PX625A, will work
in your camera.

The CdS meter technology was based on the inherent characteristics of the
mercury-oxide battery. Personally, I like these meters. Unfortunately,
everyone hates mercury-oxide batteries. 

People are hipocritical, however. They should also stop using gold. Much of
the mercury pollution comes from illegal use of mercury in gold processing.

I don't have any experience with the new Wein batteries. They may work.
Would anyone wish to comment?

Best regards,


At 06:49 AM 8/2/96 -0800, you wrote:
>>From: (Ken Wilcox)
>>Date: Thu, 1 Aug 1996 18:49:46 -0400
>>Subject: Re: Meter for M4
>>The MC is selenium celled and not as desirable, IMHO as the later meters.
>>For the M4 you should use an MR4 meter. The MR has its switch on the end
>>where it will interfere with the rewind crank. On the MR4 the switch is on
>>the top/front where it will not. Or at least that's the way I understand
>>it. I've been told that some MR meters also have the front/top switch.
>>The MR and MR4 meters were designed for mercury cells, but have a voltage
>>regulation system that allows them to use 1.5V silver cells without
>Which 1.5v silver cells are these that will work on the MR4 meters?  Does
>the Leicaflex SL bodies also have a regulation system that allows them to
>use 1.5v silver cells?
>Al Lee