zoom lens

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zoom lens

a lens system that allows the focal length of a camera lens to be varied continuously without altering the sharpness of the image

Zoom Lens


a combination of a telescopic attachment and an objective lens, forming an optical system with a variable focal length. The mechanical motions of the individual elements of the telescopic attachment ensure that the image scale of an object varies smoothly within a specified range. The focal length of a zoom lens is varied, but the sharpness of focus of the objective and the relative aperture remain unchanged.

Zoom lenses are used most often on motion-picture cameras for creating the illusion that the camera is approaching or receding in cases where it is not desirable to move the camera relative to the object being filmed. Because the aberrations of the telescopic attachment and the objective lens are usually calculated separately, the same attachment may be used with different objective lenses.


zoom lens

[′züm ¦lenz]
A system of lenses in which two or more parts are moved with respect to each other to obtain a continuously variable focal length and hence magnification, while the image is kept in the same image plane. Also known as variable-focal-length lens; varifocal lens.
References in periodicals archive ?
5 zoom lens with a 3-megapixel sensor, and the $449 HP Co.
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Covering the commonly used focal length range of 18mm to 80mm, this new Zoom Lens combines the functionality of Canon EF lenses with the precision and cinematic look of Canon Cinema lenses.
Thales's ruggedised 10x20 HD D/N zoom lens is a valuable asset in the fight to control borders, protect sensitive sites such as airports and nuclear power plants, and provide security during major sporting or political events.
6B portable HD zoom lens features an advanced new optical design that helps ensure high-peripheral resolution and contrast from its closest subject-focusing distance out to over 19 feet.