Alpha Channel: No, Looped Video: No, Frame Rate: 29.97, Resolution: 1920x1080, Video Encoding: H.264, File Size: 104mb, Number of Clips: 1, Total Clip(s) Length: 0:12

A short depth racking focus over a book shelf at the municipal library. 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.