visual achromatism

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visual achromatism [′vizh·ə·wəl ā′krō·mə‚tiz·əm]

(optics)

In an optical system, the removal of chromatic aberration or chromatic differences of magnification between light at the wavelength of the Fraunhofer C line at 656.3 nanometers and the F line at 486.1 nanometers in order to minimize these defects at wavelengths at which the human eye is most sensitive. Also known as optical achromatism.

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