- photovisual
- pho·to·visual
English syllables. 2014.
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 — “+ 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
