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E-book A Beginner's Guide to Digital Photography
Traditional film photography uses a chemical process to expose and capture images. The camera lens and body allow a prescribed amount of light to come into contact with the film, which is basically a sheet of plastic that has been coated with a light sensitive chemical compound. Once the film is sufficiently exposed to light an invisible picture is formed. When the film is developed, other chemicals are applied and the image then becomes perceptible forming a negative image which then can be enlarged and printed on photographic paper.
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