The quest for ISO - which came first, egg or hen?

Started Sep 26, 2013 | Discussions thread
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pforsell Senior Member • Posts: 1,381
The quest for ISO - which came first, egg or hen?
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Is ISO part of exposure? Here is a very simple representation of how to get from a hand-held lux meter to ISO "speed." As we see, to calculate ISO, we first need exposure. And to calculate exposure, we do not need ISO.

four simple formulas

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