variables:
camera (4)
illumination (2)
white balance (4)
exposure (3)

cam1 - Canon EOS20D with Ultrasonic EF-S 17-85 f/4-5.6 lens at 85mm
cam2 - Canon Powershot G1 - zoomed in
cam3 - Sony A100 with standard kit 18-70 zoom lens at 70mm
cam4 - Canon Powershot A540 - zoomed in

illum1 - partly cloudy afternoon
illum2 - mostly sunny morning

wb1 - sun
wb2 - clouds
wb3 - fluorescent
wb4 - custom, metered on the color chart

aperture value: f/8.0
shutter speeds:
exp1 - 13
exp2 - 8
exp3 - 5

(shutter speeds and aperture values n/a for cam5 because it doesn't have manual settings for these. instead, shots were taken at EV -1, 0, and +1)