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Special effects embrace a wide array of photographic, mechanical, pyrotechnic, and model-making skills. The most important resource of the special effects department is the optical printer, essentially a camera and projector operating in tandem, which makes it possible to photograph a photograph. In simplest form this apparatus is little more than a contact printer with motorized controls to execute simple transitions such as fades, dissolves, and wipes. A 24-frame dissolve can be accomplished by copying the end of one film scene and the beginning of another onto a third film so that diminished exposure of the first overlaps increased exposure ...(100 of 19892 words)