Archived posting to the Leica Users Group, 1997/02/23

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Subject: Meter Callibration
From: Stephen Kobrin <kobrin2@xman.wharton.upenn.edu>
Date: Sun, 23 Feb 1997 17:30:06 -0500 (EST)

I would like to return to an issue discussed several months ago.  My MR-4
meter has been cleaned and repaired and I took out the battery and set the
zero adjustment.  When I compare it to my Sekonic L-318 to check the
reading, I find that it is about 1/2 to 3/4 of a stop high in bright light
(that is underexposed compared to the Sekonic), but just about dead on in
shade.  I have no reason to doubt the accuracy of a reasonably new digital
meter.  Is it possible that the Leica Meter is accurate at low light levels,
but slightly off when the light is stronger?  That is, that the error is
non-linear?  

It is a relatively simple matter to make a slight mental adjustment in
brighter light, but I am curious about others' experience with the MR-4 and
other similar meters.  Can I be confident that, assuming a strong battery,
the readings will be stable over time?  Are there other factors that might
affect the relative accuracy of the meter?

Steve