achromatic lens

American  

noun

Optics.

1. a system of two or more lenses that is substantially free from chromatic aberration and in which the lenses are made of different substances so that the focal length of the system is the same for two or three wavelengths of light.

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Etymology

Origin of achromatic lens

Probably earlier than 1860–65

Example Sentences

If not, the substitution of an achromatic lens will be of no advantage.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" by Various

Photographic Query.—Given the diameter and focal length of a simple achromatic lens; at what distance from it must a diaphragm of given diameter be placed to give the best possible image?

From Notes and Queries, Number 235, April 29, 1854 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by Various

Calculation shows that, if the aperture be 1⁄5 in., an achromatic lens has no sensible advantage if the focal length be greater than about 11 in.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" by Various

One is painted with the most brilliant hues of Romanticism, and glows with the essence of the Romantic spirit--Aspiration; the other looks at life through an achromatic lens, and is a catalogue of Realities.

From Essays on Russian Novelists by Phelps, William Lyon

For average photography, the camera fitted with Kodak Ball Bearing shutter and tested meniscus achromatic lens is amply efficient, for it will make excellent pictures under ordinary conditions.

From Kodaks and Kodak Supplies 1914 by Canadian Kodak Company