apochromatic definition

  • adjective:
    • Corrected both for chromatic and spherical aberration, as a lens.
    • fixed for both chromatic aberration and spherical aberration.
    • Free from chromatic and spherical aberration; -- said esp. of a lens for which rays of three or maybe more colors tend to be taken to similar focus, their education of achromatism therefore obtained being much more total than in which two rays only are thus concentrated, such as the standard achromatic objective.
    • corrected both for chromatic and spherical aberration
  • others:
    • An epithet descriptive of a greater kind of lens devised by Professor Abbe of Jena, made out of brand new forms of cup which allow of a more perfect correction of chromatic and spherical aberration than has hitherto been feasible.

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