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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.
After entering the optics industry as the exclusive North American wholesale distributor of LOMO products, Mark Levitin and Pavel Shvartsman launched OpticsPlanet in 1999 to build a direct-to-consumer e-commerce destination for optics, bootstrapping the company with their own private funding. [2]
Spring Branch is a district in west-northwest Harris County, Texas, United States, roughly bordered by Tanner Road and Hempstead Road to the north, Beltway 8 to the west, Interstate 10 to the south, and the 610 Loop to the east; it is almost entirely within the city of Houston. [4]
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.
Variable-zoom telescopic sights in the low magnification range (1–4×, 1–6×, 1–8×, or even 1–10×) are known as low-power variable optics or LPVOs. These telescopic sights are often equipped with built-in reticle illumination and can be dialed down to 1× magnification.
Vortex Optics is a DBA of Sheltered Wings, Inc., which was incorporated in Wisconsin in 1989. Sheltered Wings, Inc. DBA Vortex Optics began in 2002. In 2022 after extensive research, testing and reviews Vortex became an official supplier and contractor to the American Military as the U.S. Army selected Vortex‘s XM-157 fire control system for its Next Generation Squad Weapon program.
Using near-field optical techniques, researchers currently resolve features in the order of tens of nanometers in size. While other imaging techniques (e.g. atomic force microscopy and electron microscopy ) can resolve features of much smaller size, the many advantages of optical microscopy make near-field optics a field of considerable interest.
Radius of curvature sign convention for optical design. Radius of curvature (ROC) has specific meaning and sign convention in optical design.A spherical lens or mirror surface has a center of curvature located either along or decentered from the system local optical axis.