1. Using 3 identical 4x5 grey cards set 1 foot apart, overlapping slightly and placed at a 45 degree angle from the camera angle. Make 4 photographs of the cards with the light 2 feet, 4 feet, 8 feet, 16 feet and 32 feet from the middle card. Use an incident meter on the middle card to give the correct exposure. The middle card should have the same value on each photograph.
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