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Zoom lens

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Zoom lens
Definition
Wikipedia articleDbpedia source
A zoom lens is a mechanical assembly of lens elements for which the focal length can be varied, as opposed to a fixed focal length (FFL) lens. A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. A lens that loses focus during zooming is more properly called a varifocal lens. One sacrifice of a zoom lens is wide open aperture image quality and maybe other sacrifices, because there is no perfect lens. All lenses (mainly zoom lenses) is a compromise of features-size, weight, price, focal length range, image quality, autofocus performance, build quality and other features.
Zoom lens
English Wikipedia http://en.wikipedia.org/wiki/Zoom_lens
Spanish wikipedia http://es.wikipedia.org/wiki/Zoom
Wiki page external link http://www.adaptall-2.com/articles/InsideZoomLens/InsideZoomLens.html

Conceptual map: Zoom lens

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Fecha publicación: 28.8.2014

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