In filmmaking, the cinematographer or director of photography (DP or DoP) is sometimes called lighting cameraman or first cameraman. The DP may operate the camera themselves, or enlist the aid of a camera operator or second cameraman to operate it or set the controls. The first assistant cameraman (1st AC), also known as a focus puller, is responsible for maintenance of the camera, such as clearing dirt from the film gate and adjusting the follow focus. A second assistant cameraman (2nd AC), also known as a clapper loader, might be employed to load film, slate scenes, or maintain the camera report (a log of scenes, takes, rolls, photographic filters used, and other production data)