Taking Black and White Photography:
install "lghtmtr" app (on iPhone)
Follow the "Sunny 16" rule (see chart below)
How much difference does 1 "full" F-stop make? (see chart below). All images shot at 1/500
F 16 - Good contrast
F 11 - Excellent contrast
F 8 - Good contrast
F 5.6 -Mediocre contrast