The optics of photography and photographic lenses (1904)
Taylor, J. Traill (John Traill), 1827-1895, Everitt, P. F · London ; New York : Whittaker & Co. · leaf 163
OBLIQUE DIAPHRAGM. I5i instead of the right angle at which it is usually fixed. In this position it is directed downwards towards the foreground or less-lighted portion of the subject, the consequence of this being that the large volume of light bounded by the lines r> r\ and which comes from the … foreground, exceeds by many degrees that coming from the sky shown at s, s' ; and these arrive at their respec- tive foci ff> the one in a state of great attenuation in comparison with the other. The principle of the oblique stop is the same whether it be applied to a single landscape lens, as in…
Photographic optics · Photographic lenses
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