How is it possible to replace one incident measurement with two grey card readings?

posted in: Specials | 1

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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:

Integral measurement

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.

Incidentmeter 5Incidentmeter 6

The trick is in the measurements and in the math.

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  • issacc

    Do have app. for the light meter for the android.