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Most early binoculars used Galilean optics; that is, they used a convex objective and a concave eyepiece lens. The Galilean design has the advantage of presenting an erect image but has a narrow field of view and is not capable of very high magnification. This type of construction is still used in very cheap models and in opera glasses or ...
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.
Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances. Magnification power below 5× is usually desired in these circumstances in order to minimize image shake ...
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Research Enterprises Limited. Coordinates: 43.712821°N 79.354868°W. One of REL's more popular products was their 7 × 50 military binoculars. Research Enterprises Limited (REL for short) was a short-lived Toronto -based Crown Corporation that built electronics and optical instruments during World War II. They existed only six years from late ...
Ophthalmology, optometry. [edit on Wikidata] Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears. Man with glasses.
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