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  2. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    Most compact binoculars feature magnifications of 7× to 10×, and objective diameter sizes of a relatively modest 20 mm to 25 mm, resulting in small exit pupil sizes limiting low light suitability. Roof prism designs tend to be narrower and more compact than equivalent Porro prism designs.

  3. Bushnell Corporation - Wikipedia

    en.wikipedia.org/wiki/Bushnell_Corporation

    The company was founded in 1948 by David P. Bushnell, when he returned to California from his honeymoon in Japan with two crates of binoculars and sold them by mail order. Bushnell made precision binoculars affordable to middle-class Americans for the first time through a strategy of importing from manufacturers in Hong Kong , Taiwan , and ...

  4. Porro–Abbe prism - Wikipedia

    en.wikipedia.org/wiki/Porro–Abbe_prism

    The Porro–Abbe system reduces the lateral beam axis offset by 23% compared to a traditional double Porro prism system in binoculars. The prism is not dispersive since light enters and exits the prism only at normal incidence. Since the light is four times reflected, an even number of times, the image's handedness is not changed. For ease of ...

  5. Perger prism - Wikipedia

    en.wikipedia.org/wiki/Perger_prism

    Perger-Prism beam path; the cemented plane is colored blue Leica GEOVID 8×42 HD-B laser rangefinding "Perger–Porro prism system" binoculars that have a 14 mm (0.55 in) eyepiece/objective axis offset used by a hunter. A Perger prism or Perger–Porro prism system is a prism, that is used to invert

  6. Schmidt–Pechan prism - Wikipedia

    en.wikipedia.org/wiki/Schmidt–Pechan_prism

    A Schmidt–Pechan prism is a type of optical prism used to rotate an image by 180°. These prisms are commonly used in binoculars as an image erecting system. The Schmidt–Pechan prism makes use of a roof prism section (from the German: "Dachkante", lit. roof edge ). Binoculars designs using Schmidt–Pechan prisms can be constructed more ...

  7. David P. Bushnell - Wikipedia

    en.wikipedia.org/wiki/David_P._Bushnell

    Founder of Bushnell optics company. David Pearsall Bushnell (1913–2005) was an American entrepreneur who founded the Bushnell optics company in 1948. Bushnell made precision binoculars affordable to middle-class Americans for the first time through a strategy of importing from manufacturers who provided optics to his patented specifications.

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