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  2. List of longest smartphone telephoto lenses - Wikipedia

    en.wikipedia.org/wiki/List_of_longest_smartphone...

    This is a list of smartphones with a telephoto lens that offers a focal length (35mm equivalent) of at least 100mm or "4× optical zoom" with an imaging area equivalent to a 1/3.5″ or larger sensor. Smartphone lenses are often marketed in terms of "optical zoom" [1] relative to the phone's main camera. For example, 120mm is usually referred ...

  3. Periscope lens - Wikipedia

    en.wikipedia.org/wiki/Periscope_lens

    Schematic of a conventional and a periscope zoom lens A smartphone with a 5x optical zoom periscope lens camera, recognizable by the rectangular shape of its lens. A periscope lens, sometimes called a folded lens, is a mechanical assembly of lens elements that uses a prism or mirror to redirect the light through the lenses with a 90° angle to the optical axis, as in a periscope.

  4. Sigma 200-500mm f/2.8 EX DG lens - Wikipedia

    en.wikipedia.org/.../2.8_EX_DG_lens

    The Sigma 200-500mm f/2.8 EX DG lens is a professional-level telephoto zoom lens made by Sigma Corporation. [1] It is notable for being the first lens with an aperture of f / 2.8 and a focal length of 500mm. [2] This combination allows very distant objects to be photographed at high shutter speeds in dimmer light, compared to other telephoto ...

  5. The best lenses for iPhone and Android phones in 2022 ... - AOL

    www.aol.com/news/best-lenses-iphone-android...

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  6. Telephoto lens - Wikipedia

    en.wikipedia.org/wiki/Telephoto_lens

    A telephoto lens, also known as telelens, is a specific type of a long-focus lens used in photography and cinematography, in which the physical length of the lens is shorter than the focal length. [ 1 ] : 93 This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus lens ...

  7. 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]