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

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.

More? Click here:

Incidentmeter.com

Published by

Chris Marquardt

Chris Marquardt is a photographic mythbuster and the host of Tips from the Top Floor, the world's longest running photography show. He has taught photography all over the world and his mission is to enable anybody to become a better photographer. He is also a regular guest on the TWiT Network.

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