aspherical lens

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• Aspherical — may refer to:* Aspherical space, a concept in topology * Aspherical lens, a type of lens assembly used in photography which contains an aspheric lens …   Wikipedia

• Lens speed — refers to the maximum aperture diameter, or minimum f number, of a photographic lens. A lens with a larger maximum aperture (that is, a smaller minimum f number) is a fast lens because it delivers more light intensity (illuminance) to the focal… …   Wikipedia

• aspherical — /ay sfer i keuhl/, adj. Optics. (of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations. Also, aspheric. [1920 25; A 6 + SPHERICAL] * * * …   Universalium

• aspherical — a•spher•i•cal [[t]eɪˈsfɛr ɪ kəl, eɪˈsfɪər [/t]] also a•spher′ic adj. opt (of a reflecting surface or lens) deviating slightly from a perfectly spherical shape and relatively free from aberrations • Etymology: 1920–25 …   From formal English to slang

• aspherical —   a. (of lens, etc.) free from spherical aberration …   Dictionary of difficult words

• Photographic lens — A photographic lens (also known as objective lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media… …   Wikipedia

• Aspheric lens — An aspheric lens or asphere is a lens whose surfaces have a profile that is neither a portion of a sphere nor of a circular cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.The asphere …   Wikipedia

• Canon EF lens mount — The EF lens mount allows all the Canon EF lenses to be used on any of the Canon EOS line of cameras made by Canon Inc.Unlike the EF s breech lock predecessor, the FD mount, the EF mount uses a bayonet style mount. EF stands for Electro Focus :… …   Wikipedia

• Canon EF 50mm lens — The EF 50mm lenses are a group of normal prime lenses made by Canon Inc. that share the same focal length.These lenses have an EF type mount, that fits the Canon EOS line of cameras.When used on a digital EOS body with a field of view… …   Wikipedia

• Canon EF 35mm lens — The EF 35mm lenses are a group of wide angle prime lenses made by Canon Inc. that share the same focal length.Focal lengths of 24mm to 35mm are considered wide angle. So the focal length of these lenses are at the long end of the wide angle range …   Wikipedia

• Canon EF 85mm lens — The EF 85mm lenses are a group of medium telephoto prime lenses made by Canon Inc. that share the same focal length.These lenses have an EF type mount, that fits the Canon EOS line of cameras. Focal lengths of 70mm to 200mm are usually used for… …   Wikipedia