Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 50
LUMMER’S PHOTOGRAPHIC OPTICS 34 CHAP. focal plane and the object, there is produced a real or a virtual image of it. Whichever of the two it be, the distortion is, however, negative so long as the stop is situated in front of the lens-system. In the particular case where the stop coincides with the… … Fig. 7. — «, Reticulated Object ; Barrel-shaped (negative) Distortion ; c, Pincushion-shaped (positive) Distortion. condition of orthoscopy, so far as it relates to the accurate reuniting of the chief rays, is in contradiction to the require- ment of great intensity of illumination; for, in…
Photographic optics
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