Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 93
DOUBLE-OBJECTIYES 77 XI DOUBLE-OBJECTIVE TYPE NO. 4 In this type each component consists of an objective of three lenses cemented together, and which is already more or less spherically and chromatically corrected, and yields an anastigmatically flattened image. 1. Double Anastigmat of C. P. Goerz.… … Fig. 22. — Goerz’s Double its performance as a whole, the double Anastigmat. anastigmat marked a distinct advance over the ordinary aplanats. How far its performance may be appraised when compared with the anastigmat of Zeiss, consist- ing of five lenses only, there is not yet any decided concensus…
Photographic optics
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