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cemented glass

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  • flint glass — Optics. an optical glass of high dispersion and a relatively high index of refraction, composed of alkalis, lead oxide, and silica, with or without other bases, sometimes used as the diverging lens component of an achromatic lens. [1665 75] * * * …   Universalium

  • Eyepiece — For the device for looking through a camera, see viewfinder. A collection of different types of eyepieces. An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is… …   Wikipedia

  • Optical aberration — v · d · e Optical aberration …   Wikipedia

  • Carl Zeiss AG — Infobox Company name = Carl Zeiss AG type = Aktiengesellschaft foundation = Jena, Germany (1846) location = flagicon|GEROberkochen, Germany slogan = We make it visible key people = Dr. Dieter Kurz, CEO and President num employees = 12,844 (March… …   Wikipedia

  • Tessar — Infobox lens design scheme = Zeiss Tessar.svg year = 1902 author = Paul Rudolph elements = 4 groups = 3 aperture = f/6.3 (1902) f/4.5 (1917) f/2.8 (1930)The Tessar is a famous photographic lens design conceived by physicist Paul Rudolph in 1902… …   Wikipedia

  • Large format lens — Large format lenses are photographic optics that provide an image circle large enough to cover large format film or plates. Large format lenses are typically used in large format cameras and view cameras.Photographic optics generally project a… …   Wikipedia

  • Ceramic engineering — Simulation of the outside of the Space Shuttle as it heats up to over 1,500 °C (2,730 °F) during re entry into the Earth s atmosphere Ceramic engineering is the science and technology of creating objects from inorganic, non metallic… …   Wikipedia

  • Sodium silicate — E550 redirects here. For the Italian locomotive, see FS Class E550 Sodium silicate …   Wikipedia

  • Doublet (lens) — For other uses, see Doublet (disambiguation). An achromatic doublet. In optics, a doublet is a type of lens made up of two simple lenses paired together. Such an arrangement allows more optical surfaces, thicknesses, and formulations, especially… …   Wikipedia

  • Polarizer — For the photographic filter, see Polarizing filter (Photography). A polarizing filter cuts down the reflections (top) and made it possible to see the photographer through the glass at roughly Brewster s angle although reflections off the back… …   Wikipedia

  • cobalt processing — Introduction       preparation of the metal for use in various products.       Below 417° C (783° F), cobalt (Co) has a stable hexagonal close packed crystal structure. At higher temperatures up to the melting point of 1,495° C (2,723° F), the… …   Universalium

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