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Leupold & Stevens, Inc. is an American manufacturer of telescopic sights, red dot sights, binoculars, rangefinders, spotting scopes, and eyewear located in Beaverton, Oregon, United States. The company, started in 1907, is on its fifth generation of family ownership.
Parameters listed on the prism cover plate describing 7 power magnification binoculars with a 50 mm objective diameter and a 372 foot (113.39 m) field of view at 1,000 yards (914.4 m) Binoculars are usually designed for specific applications.
One of REL's best known products were their binoculars. A common 6x30 set was produced to the extent of about 50,000 examples, while a 7x50 set added another 25,000 examples. A very small number, about six, of an experimental 20x72 were also built. [28] Another well known REL product was a series of telescopic sights for the Lee–Enfield No. 4 ...
The borosilicate glass Schott BK7 (glass code 517642) is an extremely common crown glass, used in precision lenses. Borosilicates contain about 10% boric oxide, have good optical and mechanical characteristics, and are resistant to chemical and environmental damage.
Objective lenses of binoculars. In optical engineering, an objective is an optical element that gathers light from an object being observed and focuses the light rays from it to produce a real image of the object. Objectives can be a single lens or mirror, or combinations of several optical elements.
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.