Not many people own a lightsource recommended by the meter manufacturers with which to calibrate their meters.
I am just curious what other people do to keep an eye on calibration, short of sending it in very often.
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I know many will say to compare against another meter with the warning that there is the possibility that both meters might be off.
What else is there?
Isn't it true that the way in which ISO speeds are determined relates to a reflective meter providing an (zone v) exposure of f 16 at the ISO speed of the film when read off a gray card in direct sunlight?
If so, do you watch calibration of your meter by making a reading of a gray card every so often to see if this holds true? Or is this not true?
And then, if true, should not an incident meter provide the same reading in the exact same light?
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