- 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. 2012.
photovisual
Look at other dictionaries:
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 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
