Originally Posted by Vertex Ninja 
My limited experience with the new Ektar shows that underexposed shots look HORRIBLE, but that slightly over exposed or properly exposed direct sunlight shots look very natural with nice saturation.
Just to be clear, I'm recommending -1/3 to -2/3 EV for Ektar 100
only for scenes with highly saturated reds (and perhaps other highly saturated colors). Otherwise I've had excellent results (for everything but light skin tones) by exposing as rated.