Definition: a lens which is constructed to allow continuously variable focal length within a specific range. The effective aperture and focus settings remain unchanged throughout such adjustments.
Definition: A lens in which you adjust the focal length over a wide range. In effect, this gives you lenses of many focal lengths. Definition: A lens of variable focal length. For example, in an 80-200mm zoom lens (for a 35mm camera), the focal length can be changed anywhere between the lower limit of 80mm and the upper of 200mm. This affects the scale of the image on which the lens is focused without throwing the image out of focus.
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