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

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: Re: MR4 meters
From: "C.M. Fortunko" <>
Date: Tue, 24 Sep 1996 09:50:24 -0600


If the SL and MR meters do have compensation circuits, I will be a very
happy person. It would also mean that the meter in my M5 would be able to
operate on the silver batteries.

Right now, I have a bunch of mercury  cells in my refrigerator.

Rather than arguing, I will perform an experiment and report the results to
the group this weekend.

I plan to use my spot meter as the reference. I will also do a direct
substitution test.

I do not think you are correct, but I have been wrong before.

Best regards,

At 11:05 AM 8/2/96 -0400, you wrote:
>At 08:04 AM 8/2/96 -0600,Chris Forunko wrote:
>>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.
>Simply put, you're wrong.  The MR/MR-4 meters DO have such compensated
>circuitry and so does the SL -- read the literature from Metrawatt and
>Leica, which is hardly the blatherings of store clerks.  Virtually all
>German photo gear has such circuitry, while Japanese gear does not.  (I
>believe the Rollei 35 also lacks such circuitry, but I'd have to ask Bob
>Salomon or Harry Fleenor to be certain;  in any event, Rollei recommends
>re-calibration of even the late-production Classic.)
>I shot for more than a year with PX76 batteries (1.5v silver oxide) in my
>MR-4 and SL.  Both cameras functioned well within 1/6 stop.  I am currently
>using a Kiev prism on my Hassie with four PX76's in place of the original
>four 625's -- and it, too, is more than accurate enough for chrome work
>despite the additional 4/5 volt.
>My Canon F1, however, did NOT do well on silver-oxides:  the meter was all
>over the board and was about 1 1/3 stop off, though this was not consistent
>enough to be relied upon.
>  FAX:  +540/343-7315
>Cha robh bas fir gun ghras fir!

C.M. Fortunko, Ph.D.
Group Leader, Materials Characterization (853.05)
National Institute of Standards and Technology
Materials Science and Engineering Laboratory
325 Broadway
Boulder, CO 80303

Voice phone:(303)497-3062      FAX:(303)497-5030