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photovisual

См. также в других словарях:

  • Photovisual — Pho to*vis u*al, a. (Optics) Of certain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays. [Webster 1913 Suppl.] …   The Collaborative International Dictionary of English

  • photovisual — adjective relating to the magnitude of a star as measured by the size of its image on an isochromatic photographic emulsion …   Wiktionary

  • photovisual — pho·to·visual …   English syllables

  • photovisual — “+ adjective Etymology: phot + visual : having the same focal length for actinic rays and for the brightest of the visual rays used of an achromatic lens …   Useful english dictionary

  • photovisual magnitude — noun : the magnitude of a celestial body that is determined by observations with a photographic plate and filter combination giving nearly the same yellow green sensitivity as the human eye and that is nearly equal to the visual magnitude …   Useful english dictionary

  • Maksutov telescope — A 150mm aperture Maksutov Cassegrain telescope. The Maksutov is a catadioptric telescope design that combines a spherical mirror with a weakly negative meniscus lens in a design that takes advantage of all the surfaces being nearly spherically… …   Wikipedia

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