Method and apparatus for correcting the reciprocity law failure

Details Method and apparatus for correcting the reciprocity law failure Method and apparatus for correcting the reciprocity law failure

1981-08-24

1984-04-24

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Photography

355 38, G01J 350, G03B 2778

Patent

active

044445067

ABSTRACT:
A method and apparatus for correcting the reciprocity law failure of a photosensitive material to be exposed, for use in a picture reproducing machine such as a process camera are disclosed. Luminous energies of an original picture and a standard picture are detected by a light detector, and then the exposure luminous energy is compared with the standard luminous energy by an arithmetic unit. Then, an exposure time is calculated in a calculator by using the comparison result and fundamental data such as the standard luminous energy, a standard exposure time predetermined, and a correction factor predetermined, which are recorded in data setup means.

REFERENCES:
patent: 3178999 (1961-11-01), Clapp
patent: 4194838 (1980-03-01), Bey et al.
patent: 4222661 (1980-09-01), Wahi et al.

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