The science and practice of photography : an elementary textbook on the scientific theory and a laboratory manual (1920)
Roebuck, John R. (John Ransom), 1876-1965 · New York ; London : D. Appleton and company · leaf 182
PHOTOGRAPHY 154 fact that the different colors of light are not brought to the same focus by the simple lens, but the violet rays which are refracted most are brought to a focus nearer to the lens than the red rays, Fig. 31. The foci for the other colors fall in between. With a simple lens the… … Fig. 31. 1/30 of the focal length of the lens, and is particu- larly bad in photography because the focusing is done largely with the yellow light, while the photo- graph is taken largely by the blue, so that in the photograph the object will very generally be out of focus. It affects not only the…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
