Fall 2012 Lighting Class

Link to class blog:  FALL 2012 LIGHTING CLASS



Assignment 1:  Inverse Square Law

Part 1:

Using 3 identical 4x5 grey cards set 1 foot apart and overlapping 1" make 4 photographs of the cards with the light 2 feet, 4 feet, 8 feet and 16 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.

Results below:

Exposures:

Distance from light	Aperture	Shutter	Lightroom Compensation
2 Feet	f 5.6	1/40	+0.10
4 Feet	f 5.6	1/10	-0.15
8 Feet	f 5.6	1/3	---
16 Feet	f 5.6	1.3”	-0.05
32 Feet	f 5.6	4”	+0.10

Part 2:

Use 3 4x5 cards a black card in front, a grey card in the middle and a white card in the back. Using a single point source make all 3 cards appear to be the same value.

Results below:

We achieved an 18% grey result on each of the black, white and grey cards by moving the cards relative to the light source.  The cards were spaced as follows:

Black:  3'4" from light

Grey:    5'6" from black or 8'10" from light

White:   6'3" from grey or 15'1" from light