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In this week's photo, previsualization helped me in two distinct ways. The shot was taken as twilight merged with night. It was so dark where I stood above Achziv Beach on Israel's northern coast that I could barely make out the forms offshore that I had seen earlier in the day. Darkness prevented me from seeing the image, so I had to rely on my mind's eye. Likewise, my camera couldn't see well enough to lock on focus, so I switched to manual mode and turned the focus ring to infinity.
I waited until nightfall because I wanted a very long exposure to smooth out the tidal action and give the image a lustrous, more serene feel. I also knew from experience, and I could see in my mind, that the long exposure would whiten the moving water and boost the contrast between the rolling sea and the rock silhouettes, thus making a more dramatic image. Even when there is very little light, we are not limited to simply shooting in the dark.
Technical Data: Nikon D300, 28-105mm zoom at 32mm, f13@30 seconds, ISO 100.