How fast exactly? Film projectors move 24 frames per second for a movie. The reel has to move fast to make the film appear to have motion. The sound drum is offset by 26 frames from the lens to make sure the sound and picture are synced. Once the film roll passes by the lens, it then passes through the sound drum to correspond the sound with the picture. Film projector lights are typically xenon bulbs because xenon is very bright and can illuminate for over 2,000 hours. A shutter is used to prevent blur while the images are moving past the lamp and lens at a rapid pace. This exposure to the light is the moment in which the film is seen on the lens and displayed on the viewing screen. When the movie is finished, the film can be used in the same order once again, but it’ll be on a different reel.Īs the film moves along this conveyor belt, it’s exposed to the lamp and lens in the middle of the film projector for just an instant before moving toward the takeup reel. The film will start on the supply reel and finish on the takeup reel. The film projector continually moves reels of film roll on wheels called sprockets using the power of an electric motor. So how exactly does this technology work? We’ve broken down the complex system into a simple explanation below. It’s crazy to think a strip of still photos on film can turn into a full-length action movie right before your eyes by using a film projector. The seemingly simple film projector is constantly working and moving in sync to make motion pictures possible. Even though a film projector is the size of a box, it’s one of the most complex devices ever invented.
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