Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 102
LUMMER’S PHOTOGRAPHIC OPTICS 86 CHAP. 90°. With aperture-ratios //16 to //64 it gives good defini- tion and practical freedom from distortion right up to the margin. … Fig. 32. — Ross’s Universal Sym- street scenes, as well as for groups metric Anastigmat. and portrait work. With the aperture-ratio given, they cover a view-angle exceeding 65°. Each component consists of a triple - cemented lens in which three kinds of glass are used. It therefore has a certain…
Photographic optics
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
