f/8 at 1/500 so I can freeze the wave. I understand that it's the same as f/11 at 1/250th.
My understanding of sunny 16 is: f/16 at 1/250th on a sunny day if I shoot iso200 film.
Since it was overcast but still bright I opened the aperture to f/11.
By 'sunny 16' i mean that I start at sunny 16 and then adjust according to the light. In this case opening up the aperture to f/11.
Maybe I should've kept it the same because the sand was almost white and reflecting, too.