Roles during producing a film

There are many different roles present in the making of film. Although there are many many jobs, small and large. The main ones consist of director, DOP/camera, lighting and sound. They all have different responsibilities that are very important in the creation of a film. 

Director
A film director is a person who directs the making of a film. Generally, a film director controls a film's artistic and dramatic aspects, and visualizes the script while guiding the technical crew and actors in the fulfillment of that vision. The director has a key role in choosing the cast members, production design, and the creative aspects of filmmaking.

Director of Photography
The DP, or Cinematographer, is the camera and lighting supervisor on the production. DP is in charge of the visual look and design of the entire movie. This means figuring out, with the Director during Preproduction, how to visually bring the script to life and how that should be photographed. DPs involvement is now pushing into postproduction as well to insure that the visual design is being executed or to help decide revisions to that design. Understanding the “workflow” of the imagery, and the creative and financial implications of that workflow from production through postproduction, is becoming increasingly crucial.
Besides overseeing the work of the camera crew, the DP is also assisted by the grips and electricians in preparing the technical aspects of recording an image on film or CCD. Specific duties will include:
• Operation of cameras
• Coordination of lighting, angle, motion control, media, settings, etc.
Mixer/Recordist

The mixer, aka recordist, is the on-set/on-location sound engineer responsible for the recording of production sound and any sync-related on-set sound mixing and playback. Specific duties will include:
• Supervising capture of audio onto various devices from various sources
• Maintenance and management of on-set sound equipment
• Assist in the recording of ADR, foley, & music during postproduction
Boom Operators
The boom operators work under the supervision of the mixer/recordist in the recording of production sound, holding mic booms, placing mics, holding cables, and operating various recording devices. Specific duties will include:
• Holding mic booms and cables
• Headphone monitoring of mics
• Mic placement, set-up, and tear down.
• Operation of recording devices
Lighting
Electrical Lighting Technicians (ELT) or simply Lighting Tech., are involved with rigging stage and location sets and controlling artificial, electric lights for art and entertainment venues (theatre or live music venues) or in video, television, or film production.