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A zoom lens is a mechanical assembly of lens elements for which the focal length can be The convenience of variable focal length comes at the cost of complexity - and some compromises on image quality, weight, dimensions, aperture.

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There are two types of lenses-prime and zoom. Prime lenses have a fixed focal length and zoom lenses have variable focal lengths. The advantage of the zoom .

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A variable focal length, or zoom, lens is designed so the focal length can be changed by mechanically moving the elements within the lens. The movement of .

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(a) A fixed focal length lens is just that - a lens which does not have the capability to change its focal length. A variable focal length lens is made.

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Is a zoom lens or a prime (fixed focal length) lens the best choice? Let us help you determine what is right for you.

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A lens that could zoom in focal length but, which did not hold its focus from one focal length to another was termed a variable focal length lens.

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United States Patent O 3,, VARIABLE FOCAL LENGTH LENS SYSTEM Eugene Turula and Geraldine B. Lynch, both of Rochester, N.Y., assignors.

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This results in a variable focal-length lens for atoms. The experimental results are in good agreement with a theoretical model based on a continued-fraction.

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The Focal length of a lens describes how wide its field of view is, and By doing that, they created a variable focal length lens — or a 'zoom'.