Archived posting to the Leica Users Group, 2002/05/13

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Subject: Re: [Leica] MR4 question
From: John Collier <>
Date: Mon, 13 May 2002 07:49:04 -0600

I successfully use a MR-4 on my M4-2 and M2. It works well and the 
coupling to the shutter speed dial helps speed things up. There are no 
major issues but check carefully any meter you buy.

The most common problem seems to be a missing or broken off battery 
door. So be gentle when changing batteries. It is also common for the 
circuit board to oxidize and develop breaks. New circuit boards are 
available but they are not inexpensive. Usually you can just run a wire 
to get things working again. The worst problem is a broken or damaged 
meter coil/indicator unit. The part alone is more than a MIB meter so do 
not buy one with a indicator that just flops around.

It is getting difficult to find mercury batteries but it is simple to 
have it adjusted to take silver cells. Do not use the alkaline cells as 
your meter readings will change as the battery discharges. There are 
various adapters you can buy or make but they do not always work well.

CDs meters are a little bit more sensitive to the yellows and reds, have 
a memory problem when exposed to very bright light (five to ten minutes 
to settle down after being pointed at the sun) and need time to 
stabilize when measuring very low light. Nothing to worry about, just 
things to remember.

John Collier

PS: Ugly ones are cheap but work just fine.

On Monday, May 13, 2002, at 06:38 AM, wrote:

> Can anyone give me their impressions with regard to using an MR4 meter 
> on,
> say, an M4-P?  Is it a good way to go, does it give accurate readings?

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