The VariZoom RockZFI utilizes a pressure-sensitive, side-to-side rocker switch like broadcast zoom controls. This rocker has a greater range of motion for a finer degree of zoom control than the throttle style zoom controls. Adjust the exposure or focus with a finger, smooth and quiet knobs provide easy operation while you compose your shots. Independent focus/iris knobs allow for two people to operate together for critical focus during moving shots or crane moves, imagine the possibilities! The body switches click into position, letting you watch the picture, not your hands.