Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 80
lat and stigmatic image, must be so constructed, is, according to our nomenclature, that it should be composed of a new and an old achromat, in one of which the cemented surface should possess a converging effect and in the other a diverging effect. This principle once enunciated, it became a… … Fig. 17. — Zeiss’s Am.^tig- flattening of the field.” Since this Vrnat, Series VII. objective does not consist of separated members, it is not necessary that each of the latter should be in itself achromatic ; it is rather preferable to admit large opposed aberrations in both members, in order to…
Photographic optics
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