The hand unit has controls for the focus iris and zoom functions for the camera assistant. Additionally, the hand unit uses a microwave transmitter with a long range antenna allowing the operator control over the lens and camera functions without needing to be tethered to the camera. Common uses for the Preston system include remote camera placements, such as on a crane or for stunts, where personnel could be in harms way, and also for use on the Steadicam.
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