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  2. Periscope - Wikipedia

    en.wikipedia.org/wiki/Periscope

    Principle of the periscope. The periscope on the left uses mirrors whereas the right uses prisms. a Mirrors b Prisms c Observer's eye Principle of the lens periscope. The two periscopes differ in the way they erect the image. The left one uses an erecting prism whereas the right uses an erecting lens and a second image plane. a Objective lens b ...

  3. Periscope lens - Wikipedia

    en.wikipedia.org/wiki/Periscope_lens

    Schematic of a conventional and a periscope zoom lens Xiaomi Mi 10 Ultra 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. List of the United States Army fire control and sighting ...

    en.wikipedia.org/wiki/List_of_the_United_States...

    F234 Mount Telescope, M35, and Telescope, M31 F235 Periscopes, telescopes for periscopes, and direct sighting telescopes for use in tanks. V1 Periscope, M4A1 with Telescope, M47A2

  5. List of longest smartphone telephoto lenses - Wikipedia

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

    Xiaomi Mi 11 Ultra with periscope telephoto lens (rectangular opening below the two lenses). 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.

  6. Telephoto lens - Wikipedia

    en.wikipedia.org/wiki/Telephoto_lens

    A collection of telephoto lenses. 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.

  7. List of telescope types - Wikipedia

    en.wikipedia.org/wiki/List_of_telescope_types

    Telescopes can be classified by optical design or mechanical design/construction. Telescopes can also be classified by where they are placed, such as space telescopes . One major determining factor is type of light, or particle being observed including devices referred to as "telescopes" that do not form an image or use optics.

  8. Afocal system - Wikipedia

    en.wikipedia.org/wiki/Afocal_system

    A simple example of an afocal optical system is an optical telescope imaging a star, the light entering the system is from the star at infinity (to the left) and the image it forms is at infinity (to the right), i.e., the collimated light is collimated by the afocal system. [2]

  9. Category:Telescopes - Wikipedia

    en.wikipedia.org/wiki/Category:Telescopes

    This category contains articles about telescopes used for optical astronomy, ... List of telescope parts and construction; Periscope lens; PLate OPtimizer; Polar ...