Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 116
s 3 seconds. For mountain photography, and for landscapes taken from balloons for topographical purposes, the tele-objective is peculiarly adapted. Mr. Dallmeyer’s first construction consisted of a single cemented positive of wide aperture-ratio combined with a single cemented negative lens, with a… … Fig. 47. — Dallmeyer’s Tele-objective. adapted to a tube with rack-work, and as a negative back component a double combination negative element. This is illustrated in Fig. 47. At first, for the sake of getting high magnification (which depends on the ratio of to /^), it was thought advisable to…
Photographic optics
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