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A zoom lens is a system of camera lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed-focal-length (FFL) lens . A true zoom lens or optical zoom lens is a type of parfocal lens, one that maintains focus when its focal length changes. [1]
This is a list of superzoom compact cameras, also known as travel zoom cameras. [ 1 ] [ 2 ] These are small fixed-lens " point-and-shoot " digital cameras that have a high optical zoom ratio. These cameras all include a power zoom lens that retracts into the body when not in use, along with an automatic lens cover or lens cap.
The increasingly popular 20-50mm zoom range is arguably more versatile than the more established 16-35mm lenses and shares the minimum 2.5× optical zoom ratio of 28-70mm lenses but shifted to a wider field of view.
Optical magnification is the ratio between the apparent size of an object (or its size in an image) and its true size, and thus it is a dimensionless number. Optical magnification is sometimes referred to as "power" (for example "10× power"), although this can lead to confusion with optical power .
This is a list of lenses designed for APS-C mirrorless cameras that have an optical zoom ratio greater than 7×. For comparison, the longest superzoom lens designed for DSLRs was the Tamron 18-400mm F3.5-6.3 for EF and F mounts, which had a 22× optical zoom ratio.
Unlike most point-and-shoots with a zoom lens, bridge cameras require a manual lens cap, as they do not include an automatic lens cover. The additional size of a bridge camera compared to a compact camera makes room to fit a larger image sensor, a lens with a larger aperture or longer zoom, or some
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