Photo Tips: 1. A shutter speed of 1/200 is great for keeping gently moving things like faces sharp, while keeping water smooth and rain falling through the sky. 2. When your camera is in a water housing, it’s really difficult to constantly check and change exposure settings, so I lock down my look and feel (shutter speed and aperture) in manual mode (M) and simply use auto-ISO on matrix metering. Nikon’s auto-ISO with matrix metering is unbelievably good for shooting people in constantly changing lighting scenarios.