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2. Porro prism - Wikipedia

   en.wikipedia.org/wiki/Porro_prism

   The Porro–Abbe two prisms variant has been further developed into the Perger prism, which combines the properties of Porro and roof top prism, requiring only a small offset of the beam path and also enabling a measuring beam or an illuminated display to be reflected through the changed angle of the reflection surfaces and the cemented surface ...

3. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   Porro prism binoculars were made in such a way to erect an image in a relatively small space, thus binoculars using prisms started in this way. Porro prisms require typically within 10 arcminutes (⁠ 1 / 6 ⁠ of 1 degree) tolerances for alignment of their optical elements (collimation) at the factory.

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. [2] 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 ...

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. Swarovski Optik - Wikipedia

   en.wikipedia.org/wiki/Swarovski_Optik

   SWAROVSKI OPTIK, headquartered in Absam, Tyrol, Austria is part of the Swarovski group of companies. Founded in 1949, the Austrian company specialises in the development and manufacturing of long-range optical instruments in the premium segment of the market, including binoculars, telescopes (spotting scopes), rifle scopes, range finders and night sight devices.

7. Bushnell Corporation - Wikipedia

   en.wikipedia.org/wiki/Bushnell_Corporation

   Binoculars: Bushnell sells a wide variety of binoculars and was awarded the Best Buy award from Outdoor Life magazine in 2005 for their Browning Sports Optics binoculars and in 2006 for their Legend binoculars. [22] [23] Microscopes; Telescopes: Bushnell made smaller amateur optical telescopes. Some popular models include the "ARES 5", and the ...