Lesson 1 The Inverse Square Law

I did the assignment using 4"sq gray cards placed at 45 degrees facing up in order to avoid any specular reflections. Also I did an additional test with the light at 32 feet to see if the numbers continued to work. I was very careful to contain the light and not have any light hitting walls the could influence the exposure. It worked perfectly. Every time I doubled the distance the intensity of the light dropped by 1/4 or 2 stops.







To balance the Black, Gray and White Cards I had the Black card 18" from the light, the Gray card 40" from the light and the White card 92" from the light.