单词	apochromat
释义	apochromat /ˌapəˈkrəʊmat/ /ˈapəkrəmat / noun Physics A lens or lens system that reduces spherical and chromatic aberration.There are now a few apochromats on the market that are comparable in price to similar, high-end achromats.... Higher order spherical aberration in apochromats is a result of strongly curved lens surfaces. The biggest problem with early apochromats, other than their sizable cost and complexity, was light loss. Derivatives apochromatic /apəkrəˈmatɪk / adjective ... In 1868 he invented the apochromatic lens system for the microscope. The apochromatic lens, therefore, corrects for chromatic aberration to a greater degree than does an achromatic lens. I hope the following history of the apochromatic lens designs made by Roland Christen of Astro-Physics is of some interest to the readers. Origin Early 20th century: from apo- + chromatic.
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