The Exposure Formula is associated with the quote "Chance favors the prepared mind," so I take it to mean that knowing the formula and using it can help in a pinch when a meter fails or is unavailable.
Originally Posted by markbarendt
No because these meters return incident candlepower measurement units and the formula is tied to reflected candlepower measurement units.
Originally Posted by Steve Smith
I don't assert that the four stop difference is a constant. But can anybody say? Maybe it is just that.