Assignment 2

Assignment 2: Inverse Square Law

Each group will produce ONE set of images. Each person will post their group’s final images on their own blog.
Part 1: Use 3 4x5 cards: black, gray, and white. Clamp each card onto a light stand and place the cards so that they are just slightly overlapping. Using just one light source, make all three cards appear to be the same gray value. (You can move the cards and the light source until it works). Record the distance from the light source to each card.
Part 2: Post two photographs:
1. The resulting image with all three cards and the distances you recorded from the light source to each card.
AND
2. A photo of your setup in the studio.
Then, explain how you used your understanding of the Inverse Square Law to find the solution.

From light source: Black - 2', Gray - 4'6", White - 12'

Assignment 2 studio set-up

We marked down measurements on the floor and used the 1600 watt light source.  It took a few tries to get the black card to read the same gray value as the other two but we arrived at the following distances with using camera settings:  ISO 1000, shutter 1/50, F3.5

Light source - 1600

Black card at 2 ft 

Grey card in middle at 4 ft 6 inches

White card in back at 12 ft from light source