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[OM] OM-1 meter calibration---how easy, how to do?

Subject: [OM] OM-1 meter calibration---how easy, how to do?
From: Phillip N Price <price@xxxxxxxxxxxxx>
Date: Mon, 26 Jul 1999 16:45:30 -0700 (PDT)
I recently bought an OM-1, and quickly discovered that using 1.5V
batteries does indeed lead to meter error of 0-2.5 stops---if I followed
the meter, I would underexpose by up to 2.5 stops (in very bright light), 
though low-light readings seemed about right. 

I shelled out $25 or $30 for a diode that the battery fits in, that
decreases the voltage and is supposed to let the meter work properly.
I use the 1.5V silver cell recommended for the unit.

On Saturday, I was shooting some pictures, and noticed that the meter
substantially violated the "sunny 16" rule, this time in the other
direction: if I followed the meter, I would overexpose by about 1-1.5
stops.  It's not just the sunny 16 rule that makes me suspicious---I also
compared the meter to that of my OM-4.  I do not know if this is a problem
related to the battery, or if the meter is broken, or perhaps just needs
calibration.

I need to use this camera on a once-in-a-lifetime (probably) trip to
Africa in a week and a half. How hard is it to calibrate the meter? How
would I do it? (I'm as handy with a tiny screwdriver as the next guy, but
probably not much handier.)

Thanks very much for any help you can offer.

--Phil




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