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ZONE SYSTEM - A method introduced by photographer, Ansel Adams, for determining optimal exposure and appropriate development for an individual photograph.
ZOOM - The action of varying the focal length of a zoom lens to enlarge (zoom in) or reduce (zoom out) the image.
ZOOM LENS - A lens in which focal length is variable. Elements inside a zoom lens shift their positions, enabling the lens to change its focal length - in effect, providing one lens that has many focal lengths. (Also called a "Variable focus lens.")
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