AUTOMATIC PHOTOGRAPHIC GRADATION-MEASURING SYSTEM FOR CONTROLLING AUXILIARY EXPOSURE MEANS

摘要

The focal plane on which the photographic negative image is focused is divided into a number of parts respectively connected to light-transmitting members. The ends of the light-transmitting members are arranged in a circle and scanned by another light-transmitting member which is connected to a light receptor. The output photocurrent from the light receptor is a measure of the photographic gradation of the negative image.