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Photographic film is a strip

or sheet of transparent plastic film

This film is base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals. The sizes and other characteristics of the crystals determine the sensitivity, contrast and resolution of the film.

The emulsion will gradually darken if left exposed to light, but the process is too slow and incomplete to be of any practical use. Instead, a very short exposure to the image formed by a camera lens is used to produce only a very slight chemical change, proportional to the amount of light absorbed by each crystal.

“I think the camera was always my obsession, the camera movements. Because for me it’s the most important thing in the move, the camera, because without the camera, film is just a stage or television – nothing.”Dario Argento
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