I am not surprised that a poster from Puerto Rico could consistently fool the Nikon Matrix Metering, which still has a EV limit of 16 2/3. I live in Hawaii and its frequently bright enough to exceed that, think white wedding dress on the beach, clear sky. Makes your retina's ache (not the kodak ones). Generally speaking it does a good job, one way I can fool it consistently is overcast, voggy day in the lava field, or a bright day at the beach on lava rocks.