Seascape Photography: Tide Table & Accuweather app. Location. Look for where the sun will set and shadows. Carry a headlamp. An ND filter allows for longer exposure. f/8 or smaller. aperture allows you to slow the shutter speed down & get soft water. Focus & then switch your camera to manual focus. That way, when the light begins to fade, your lens won’t be hunting to find a focus point. Look for reflections.