Musings and Myths About an Expensive Piece of Cardboard
The following is an interesting paragraph, taken from the "The National Geographic Photography Field Guide" (by Peter K. Burian and Robert Caputo, National Geographic Society, Washington DC, 1999): "Scientific studies now indicate that an average scene actually reflects 13 percent (not 18 percent) of the light that falls on it. For the sake of consistency, gray cards have continued to be 18 percent gray, as is the one in ...