from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A lens that imparts little color; a lens that is achromatic.

from The Century Dictionary and Cyclopedia

  • n. In optics, a lens or system of lenses corrected for chromatic aberration.


from Wiktionary, Creative Commons Attribution/Share-Alike License

By shortening of achromatic.


  • PS: Vision in a complete achromat: a personal account is a very interesting feature on achromatopsia by vision scientist Knut Nordby.

    Not-so-new colour recognition

  • The magician's tale / David Hunt —An achromat suffering from total color blindness, Kay possesses a vision that informs her world and sharpens her skills as talented photographer.

    3/16: New at the library this week

  • An achromat brings those two wavelengths to the same focus, with other wavelengths very slightly out of focus.

    MAKE Magazine

  • You can, for example, buy semi-plan apochromatic objectives and plan achromat objectives.

    MAKE Magazine

  • An apochromat is corrected for three specific wavelengths of light -- usually red, green, and blue -- and brings those three wavelengths to the same focus, providing slightly sharper images than an achromat.

    MAKE Magazine

  • The first section on the knowledge argument has a number of special treats: Knut Nordby, the achromat color scientist, with a piece on what it's like to be in Mary's situation;

    fragments of consciousness


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