One thing noticed by people who are now using histograms on cameras and
in software is that metering something that is evenly lit puts all the
exposure to the left of the center of the histogram. I was surprise to
find that meters are really calibrated to 12 percent gray which is a
half stop away. Here is a better explanation than I can offer:
http://www.bythom.com/graycards.htm
Winsor
Long Beach, California, USA
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