lens field illumination

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• illumination — 1. Throwing light on the body or a part or into a cavity for diagnostic purposes. 2. Lighting an object under a microscope. [L. il lumino, pp. atus, to light up] axial i. the transmission or reflection o …   Medical dictionary

• Dark field microscopy — (dark ground microscopy) describes microscopy methods, in both light and electron microscopy, which exclude the unscattered beam from the image. As a result, the field around the specimen (i.e. where there is no specimen to scatter the beam) is… …   Wikipedia

• Köhler illumination — is a type of specimen illumination used in transmitted or reflected light microscopy [ [http://www.olympusmicro.com/primer/anatomy/kohler.html Olympus Microscopy Resource Center Köhler Illumination] ] . It was designed by August Köhler in 1893,… …   Wikipedia

• Critical illumination — or Nelsonian illumination is a method of specimen illumination used for transmitted and reflected light (trans and epi illuminated) optical microscopy. Critical illumination focuses an image of a light source on to the specimen for bright… …   Wikipedia

• Spot lens — Spot Spot (sp[o^]t), n. [Cf. Scot. & D. spat, Dan. spette, Sw. spott spittle, slaver; from the root of E. spit. See {Spit} to eject from the mouth, and cf. {Spatter}.] 1. A mark on a substance or body made by foreign matter; a blot; a place… …   The Collaborative International Dictionary of English

• spotted lens — Spot Spot (sp[o^]t), n. [Cf. Scot. & D. spat, Dan. spette, Sw. spott spittle, slaver; from the root of E. spit. See {Spit} to eject from the mouth, and cf. {Spatter}.] 1. A mark on a substance or body made by foreign matter; a blot; a place… …   The Collaborative International Dictionary of English

• spot lens — noun : a condensing lens in which the light is confined to an annular pencil by a small round diaphragm and which is used in dark field illumination …   Useful english dictionary

• Fresnel lens — A Fresnel lens (pronounced [ frɛz.nəl] or [freɪ nɛl] ) is a type of lens invented by French physicist Augustin Jean Fresnel. Originally developed for lighthouses, the design enables the construction of lenses of large aperture and short focal… …   Wikipedia

• Bright field microscopy — is the simplest of all the optical microscopy illumination techniques. Sample illumination is transmitted (i.e., illuminated from below and observed from above) white light. The most common use of the microscope involves the use of an organism… …   Wikipedia

• Single-lens reflex camera — The single lens reflex (SLR) camera uses an automatic moving mirror system which permits the photographer to see exactly what will be captured by the film or digital imaging system, as opposed to non SLR cameras where the view through the… …   Wikipedia

• Light field — The light field is a function that describes the amount of light traveling in every direction through every point in space. Michael Faraday was the first to propose (in an 1846 lecture entitled Thoughts on Ray Vibrations ) that light should be… …   Wikipedia