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  2. Binoculars - Wikipedia

    en.wikipedia.org/wiki/Binoculars

    A pair of 10×50 binoculars is better than a pair of 8×40 binoculars for magnification, sharpness and luminous flux. Objective diameter is usually expressed in millimeters. It is customary to categorize binoculars by the magnification × the objective diameter; e.g., 7×50.

  3. Monocular - Wikipedia

    en.wikipedia.org/wiki/Monocular

    The classic 7×50 marine binocular or monocular is ideally suited to low light conditions with its relatively large exit pupil diameter of 7.1mm and a realistic magnification which is practical on a moving boat.

  4. Pentax cameras - Wikipedia

    en.wikipedia.org/wiki/Pentax_cameras

    Pentax is one of the few camera manufacturers still producing medium format cameras up to 1999. There are two offerings, one in the 6×7 format—the Pentax 67 II, and one in the 6×4.5 format—Pentax 645NII. Both use 120 or 220 roll film. These cameras build on the Pentax SLR design experience.

  5. Tower Optical - Wikipedia

    en.wikipedia.org/wiki/Tower_Optical

    Tower Optical Company, Inc. Tower Optical Company, Inc. is a small, Norwalk, Connecticut -based company which has manufactured a binocular tower viewer used at major tourist sites in the United States and Canada since 1932. [1] The company's large, silver-colored devices are used at Niagara Falls, the Empire State Building and other locations.

  6. Nikon - Wikipedia

    en.wikipedia.org/wiki/Nikon

    For people named Nikon, see Nikon (disambiguation). Nikon Corporation (株式会社ニコン, Kabushiki-gaisha Nikon) ( UK: / ˈnɪkɒn /, US: / ˈnaɪkɒn /; Japanese: [ɲiꜜkoɴ] ⓘ) is a Japanese optics and photographic equipment manufacturer headquartered in Tokyo, Japan. The companies held by Nikon form the Nikon Group.

  7. Lens - Wikipedia

    en.wikipedia.org/wiki/Lens

    A burning apparatus consisting of two biconvex lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.

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