When I introduced a way to do incident metering without an incident meter I received several questions with regards to how this was possible.
Let me try to explain a bit further.
An incident light meter uses a white (but translucent) dome to integrate light from several directions:
By taking two measurements with a grey card, you can approximate this quite well, actually to the point where the results are really really close.
The trick is in the measurements and in the math.
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