Photographic camera

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G - Physics

03

B

95/53.3, 95/53.4

G03B 7/08 (2006.01) G02B 7/32 (2006.01) G03B 7/16 (2006.01)

Patent

CA 1161682

ABSTRACT OF THE DISCLOSURE Method and apparatus are disclosed which direct a preliminary pulse of radiation from a selectively energizable light source toward a subject, and a device for evaluating the amplitude of the reflected pulse of radiation therefrom so as to determine a weighted range signal as a function of the am- plitude of generally non-visible radiation frequencies selected for reducing the non-uniformity in reflectivity values of reflected visible radiation in the scene, which weighted range signal includes a reflectivity factor and a range factor. The reflectivity factor, which detracts from the range factor for focusing, significantly enhances exposure control under certain scene fighting conditions.

384731

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