Definitions

from The Century Dictionary.

  • Having the same focal length for the ultra-violet and for the visible rays of the spectrum: said specifically of an objective the color-correction of which is such that when focused by the eye it is likewise in focus for the photographic plate.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Optics) Of certain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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