Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 82
rm, an anastigmatically aplanatic single lens was designed by von Hoegh. A lens in accordance with von Hoegh’s calculations was protected by patent ^ in December 1892 by the firm of Goerz, the patent covering particularly the combination of tioo such triple cemented lenses combined as a symmetrical… … the triple system in Fig. 19. — Set of Convertible Anastigmats. being of greater aper- ture, more fully stigma tically aplanatic, and better corrected with respect to the chromatic difference of the sizes of the images produced by it. The term Satz- anastigmat means “ adaptable anastigmat ” or “…
Photographic optics
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