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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.
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 compactly than ones using Porro or Uppendahl roof and Abbe–Koenig roof prisms. A Schmidt–Pechan prism is sometimes called a Pechan prism pair. [1]
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 ...
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
A roof pentaprism used in Single-lens reflex cameras; the lower right face is the roof (dach). An Amici 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.
The prism is also less bulky than the double Porro design. The prism is sometimes simply called a "roof prism", although this is ambiguous, because other roof prisms exist, such as the Amici and Schmidt–Pechan designs. A variant of the Abbe–Koenig prism replaces the "roof" section of the prism with a single mirror-coated reflecting surface.