I wrote:
>
> Ev is not a measure of light and has no functional relationship
> with light levels. It is a measure of exposure only, and is a
> function of shutter speed and aperture, and nothing else. Light
> meters can be set to give Ev readouts, but the value shown is
> a recommended exposure, which will change with the ISO setting,
> not a measure of light.
I should add that the meter-recommended Ev will vary with the
calibration constant chosen by the maker.
Paul
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