A dictionary of photography for the amateur and professional photographer (1889)
Wall, E. J. (Edward John), 1860-1928 · New York : E. & H.T. Anthony · leaf 116
io6 DICTIONARY OF PHOTOGRAPHY. In figs. 1 8, 19, and 20 are shown some lenses by Steinheil, fig. 18 being an aplanatic rapid rectilinear, and figs. 19 and 20 Fig. 18. Fig. 19. wide-angle aplanats, some of the finest lenses of the day ; and in figs. 21 and 22 are shown two more of Steinheil's… … Fig. v> is composed of two symmetrical combinations of flint glass, and works at an aperture of //6, a great gain for rapid work. These lenses are perfectly free from spherical and chromatic aberration Fig. 22. and distortion, and for such a large aperture have a wonderful depth of focus, with an…
Photography
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