Web Definition: Zoom Lens
A zoom lens is a mechanical assembly of lenses whose focal length can be changed, as opposed to a prime lens, which has a fixed focal length. They are commonly used with still & video cameras, some binoculars & telescopes & other optical instruments. Zoom lenses are sometimes described by the ratio of their longest & shortest focal lengths. For example, a zoom lens with focal lengths ranging from 100 mm to 400 mm may be described as a 4x zoom. The term hyperzoom is used to advertise zoom lenses with unconventionally large focal length ratios, typically more than 4x & ranging up to 10x & even 12x. Photographic zoom lenses should not be confused with telephoto lenses, those with large focal lengths. While many zoom lenses provide telephoto capabilities, others are wide-angle zooms, that is, they have shorter than normal focal lengths & still others cover a range from wide-angle to telephoto. The situation is further confused by the fact that some digital cameras use electronic manipulation of the image to increase or decrease its size.
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