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A setting on advanced automatic cameras which allows the photographer to set an f-stop and have the camera magically pick a shutter speed to match based on the light metre reading. This is immensely useful when a photograph requires that you select a very broad or short depth of field and you, for some reason or another, aren't in the mood to play with your shutter speeds. The camera will get a light metre reading and make sure the film is exposed correctly.

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