Director – generally, the director will visualise a script and control the artistic and dramatic aspects of a film, whilst guiding the technical crew and actors so that their vision may be achieved.
First Assistant Director – 1st AD will track daily progress, produce schedules, arrange logistics, create call sheets, check cast and crew, maintain order on set and take care of health and safety.
Director Of Photography – a cinematographer (or DoP or DP) is in charge of the camera and lighting crews, and is responsible for achieving the artistic vision of the director and making technical decisions.
Camera Operator – the camera op uses the camera, physically holding and working it. They are governed by the director and DoP.
Camera Assistant – the AC makes sure that the camera is set up correctly. They fetch lenses, attach lenses, help set up shots, pull focus; they help the camera op with whatever they need.
The departments interrelate in many ways: