Jemma, Jihoon, and Sukshma have explored how the inverse square law can be applied to the real situation. For the first trial, we have set the three identical grey cards with the same distance for each other, and set the distance from the light as 2ft, 4ft, 8ft, 16ft, 32ft from the middle grey card to see if we could make the middle grey card identical for those different distances by manipulating shutter speed. We set ISO as 100, and f-stop as 9 consistently as we were increasing the shutter speeds by using inverse square law l=1/d
², and saw if the number calculated working same as the number appeared on the light meter. For the second trial, we have tested out using a black card in front, a grey card in the middle, and a white card in the back to see if we can make all 3 cards appear to be the same value by moving the cards and the single light source.
Single ambient light source 2ft. away from the middle grey card
1/30, f/9, ISO100
Single ambient light source 4ft. away from the middle grey card
1/8, f/9, ISO 100
Single ambient light source 8ft. away from the middle grey card
1/2, f/9, ISO 100
Single ambient light source 16ft away from the middle grey card
2, f/9, ISO 100
Single ambient light source 32ft away from the middle grey card
8, f/9, ISO 100
Demonstration Chart
Black card at the front, grey card at the middle, white card at the rear
to make all three cards identical 18% grey.
1/15, f/4, ISO 400
Production Shots
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