From American Cinematographer, Wet and Wild by George Turner (January 1998)
"Also, Howard Preston [of Preston Cinema Services] has an autofocus device called the Light Ranger, which we used. One of the problems of shooting in water is that you can't set marks down for the actors. But if you keep the Light Ranger's viewfinder crosshairs on the subject, such as a person moving around, it will focus the camera automatically. We made shots at 96fps with a wide open 300mm lens, and they came out razor-sharp. However, the Light Ranger didn't always work if there was too much rain, because a laser measures distance and the drops could sometimes interfere with the beam"
- Mikael Salomon, ASC (Director of The Flood)