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Illumination in the Focal Plane of a Camera Lens

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Abstract

Direct photoelectric measurement has been made of illumination in the focal planes of typical photographic objectives. The results in many cases differ seriously from what might be expected simply on the basis of the cos4 law plus vignetting. The deviation takes the form of an unexpectedly large rate of decrease of illumination with respect to distance from the axis, and may be so great as to have important consequences on work in color photography and photographic photometry. The effect is apparently inherent in the design of almost any photographic objective.

© 1947 Optical Society of America

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