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  2. 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 ...

  3. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

  4. 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 ).

  5. Roof prism - Wikipedia

    en.wikipedia.org/wiki/Roof_prism

    A roof prism, also called a Dachkanten prism or Dach prism (from German: Dachkante, lit. "roof edge"), is a reflective prism containing a section where two faces meet at a 90° angle, resembling the roof of a building and thus the name. Reflection from the two 90° faces returns an image that is flipped laterally across the axis where the faces ...

  6. Perger prism - Wikipedia

    en.wikipedia.org/wiki/Perger_prism

    A Perger prism or Perger–Porro prism system is a prism, that is used to invert (rotate by 180°) an image. The special feature of this prism is that, like a traditional double Porro prism system, it manages this with only four beam deflections and has neither a roof edge with the accompanying phase correction problems, a mirrored surface or ...

  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.