Movie projectionists set up and operate projectors, lights, and sound equipment to show films to audiences.

Before show time, projectionists inspect the film to be sure it is in good condition. They repair it if it is damaged or find another copy. Next, they rewind the film to the beginning of the reel. They insert the film in the magazine, or top reel, of the projector. They thread the film through the projector onto the spool. They position, install and connect microphones, amplifiers, and lights. Projectionists coordinate the timing of images on the screen with sound effects, music, and commentary. They adjust and monitor the projection light and focus, volume, and tone.

Movie projectionists often coordinate several reels of film to show them in order. In theaters, they may show ads and previews before starting the first reel of the feature film. They monitor the progress of the movie and change reels without interrupting the show. In movie theater complexes, projectionists may show films for several theaters at one time.

Projectionists clean and service projectors and speakers. They make minor repairs and notify managers when major repairs are necessary. Movie projectionists or other helpers keep track of film canisters. They return them to distributors or file them in the film library.

Some movie projectionists are self-employed. They show films to groups who hire them for special occasions. Some work in motion picture production and distribution companies. They show movies for producers, actors, critics, and others who attend private screenings. They may operate projectors for film editors and ratings reviewers.