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  2. Zoom lens - Wikipedia

    en.wikipedia.org/wiki/Zoom_lens

    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]

  3. Canon EF 28-80mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_28-80mm_lens

    Canon produced eight iterations of the lens from 1989 to 1999. The other 28–80mm lens is the EF 28–80mm f/2.8–4L USM, which was an EF mount wide-to-normal zoom lens introduced by Canon in April 1989. Being of the "L" class, it is of completely different design and structure than the aforementioned 28–80mm f / 3.5–5.6 lens. This lens ...

  4. Canon EF 28-105mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_28-105mm_lens

    The Canon EF 28–105 mm f / 3.5–4.5 USM is a higher quality zoom lens with a better build quality. Currently every version of this lens is discontinued. Some versions of the lens may include the word macro or a flower icon which indicates macro capability, however due to the 1:5.2 image magnification ratio it cannot be considered as a true ...

  5. Photographic lens design - Wikipedia

    en.wikipedia.org/wiki/Photographic_lens_design

    The design of a fixed focal length lens (also known as prime lenses) presents fewer challenges than the design of a zoom lens. A high-quality prime lens whose focal length is about equal to the diameter of the film frame or sensor may be constructed from as few as four separate lens elements, often as pairs on either side of the aperture diaphragm.

  6. List of standard zoom lenses - Wikipedia

    en.wikipedia.org/wiki/List_of_standard_zoom_lenses

    There is no precise definition of the term, but lenses marketed as "standard zoom" usually cover a range of at least 30mm to 70mm in terms of 35mm equivalent focal length with an optical zoom ratio of 2.5× (e.g. 28-70mm) to 5× (e.g. 24-120mm) — the most common being 3× (e.g. 24-70mm). [1]

  7. Canon EF-S 18–55mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF-S_18–55mm_lens

    The Canon EF-S 18–55mm lens f / 3.5–5.6 is a Canon-produced wide-angle to mid telephoto zoom lens for digital single-lens reflex cameras with an EF-S lens mount. The field of view has a 35 mm equivalent focal length of 28.8–88mm, and it is a standard kit lens on Canon's consumer APS-C DSLRs.

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  9. Canon EF 70-300mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_70-300mm_lens

    This lens is of a conventional design and was introduced in 2005, to offer an increase in performance from the earlier 75-300mm lenses in the Canon EF lens lineup. [ 3 ] [ 4 ] Like the 70–300mm f / 4.5–5.6 DO it contains an image stabilizer ; however, for focusing it uses the lower quality micro- USM design, and therefore requires the focus ...

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