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 A shutter regulates the time of exposure.

  « Image example

The shutter controls the amount of light that hits the film. Cinematographers are limited in the choice of shutter speeds, but they can control exposure time by using a variable shutter, which controls not the time the shutter is open but the size of the opening.


American Museum of the Moving Image. [www.ammi.org]
Choose "Shutters, Sprockets, and Tubes consists of six animated interactive tutorials that explain the science and technology behind movies and television."


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