sample 6 is light sandpaper
p=18, l=160

1:55pm 
aperture 2 tick marks above 4
white balance as sample 5

2:02pm starting calibration
2:35pm finished calibration

(for all samples we are previewing frontal image
 and adjusting camera to center. These adjustments
 include twisting camera slightly or placing paper under the 
 tripod leg)

3:50PM finished sample 6