Automatic control of exposure on cameras by combining luminosity data from a photometer with color data from a colorimeter and measured distances to a point in the picture frame

摘要

A reflex camera (1) with object lens (2) has a mirror (3) with inset half mirror (3a) which allows light to reach a distance measuring unit (8) via a third mirror (7). Three photometers (9R,9G,9B) on the pentaprism (5) have red green and blue filters which enable them to produce color data and a fourth photometer (9D) produces luminosity data. An exposure calculator for a sighted point uses the color data to correct exposures based on luminosity