achromatic eyepiece

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• 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

• Achromatic telescope — Telescope Tel e*scope, n. [Gr. ? viewing afar, farseeing; ? far, far off + ? a watcher, akin to ? to view: cf. F. t[ e]lescope. See {Telegraph}, and { scope}.] An optical instrument used in viewing distant objects, as the heavenly bodies. [1913… …   The Collaborative International Dictionary of English

• Huygenian eyepiece — Huy·ge·ni·an eyepiece .hī gē nē ən , .hȯi , gen ē also Huy·gens eyepiece hī gənz , hȯi n a compound eyepiece used esp. with achromatic objectives that consists of two plano convex lenses separated by a diaphragm with the convex sides facing the …   Medical dictionary

• Ramsden eyepiece — Rams·den eyepiece ramz dən n a nearly achromatic optical system that contains two plano convex lenses with the convex surfaces facing each other and is used esp. in instruments fitted with micrometer wires or a scale Ramsden Jesse (1735 1800)… …   Medical dictionary

• ramsden eyepiece — ˈramzdən noun Usage: usually capitalized R Etymology: after Jesse Ramsden died 1800 English instrument maker : a nearly achromatic optical system of two lenses used as a magnifying glass or as an eyepiece in transits or telescopes fitted with… …   Useful english dictionary

• Kellner eyepiece — /kel neuhr/, Optics. a Ramsden eyepiece having an achromatic lens, used in binoculars. [after Carl Kellner (1826 55), German opticist and lens maker] * * * …   Universalium

• Kellner eyepiece — /kel neuhr/, Optics. a Ramsden eyepiece having an achromatic lens, used in binoculars. [after Carl Kellner (1826 55), German opticist and lens maker] …   Useful english dictionary

• positive eyepiece — a single lens combination, consisting of two planoconvex lenses or of an achromatic doublet or triplet, the combination being above the plane in which the real image from the objective is formed …   Medical dictionary

• Timeline of telescope technology — Timeline of telescope technology* c.2560 BC c.860 BC Egyptian artisans polish rock crystal, semi precious stones, and latterly glass to produce facsimile eyes for statuary and mummy cases. The intent appears to be to produce an optical illusion.… …   Wikipedia

• Jesse Ramsden — Jesse Ramsden …   Wikipedia

• List of lens designs — * Achromatic doublet * Apochromatic doublet * Biconcave lens * Biconvex lens * Convex concave lens * Celor lens * Chevalier lens * Cooke Triplet * Dialyt lens * Double Gauss lens * Doublet lens * Eyepiece * Field lens * Fisheye lens * Fresnel… …   Wikipedia