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A rack focus in filmmaking and television production is the practice of changing the focus of the lens during a shot. The term can refer to small or large changes of focus. If the focus is shallow, then the technique becomes more noticeable. In professional films, a camera assistant called a focus puller is responsible for rack focusing. In his documentary film, The Sinister Saga of Making "The Stunt Man" the director Richard Rush claims he developed the technique in the 1960s.
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