A zoom lens is a mechanical assembly of lens elements with the ability to vary its focal length (and thus angle of view), as opposed to a fixed focal length (FFL) lens. They are commonly used with still, video, motion picture cameras, projectors, some binoculars, microscopes, telescopes, and other optical instruments.
Nikkor 28-200 mm zoom lens,extended to 200 mm at left
and collapsed to 28 mm
focal length at right
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