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The action of a varifocal lens system in a camera or microscope that maintains an object in focus while approaching it or receding from it; this effect may be obtained by moving two or more of the lens components at rates bearing a linear relation to one another.
a system of camera lenses that allows an object to remain in focus when the camera approaches or recedes or when the object is viewed close-up or at a distance.
To magnify (“zoom in”) or shrink (“zoom out”) an image in order to highlight some of its smaller features or some of the environment in which the imaged object is situated.