Light measurement and light control data calculation device for

Details Light measurement and light control data calculation device for Light measurement and light control data calculation device for

1983-03-01

1984-09-04

Gonzales, John

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 35, 355 38, 355 69, 355 77, G03B 2774, G03B 2780

Patent

active

044694377

ABSTRACT:
Disclosed herein is a light measuring and control data calculating device for use in a photographic enlarger. The device comprises first light detecting means for detecting the amount of light emitted from a light source, second light detecting means for detecting the emitted light amount at a position on the surface of an easel through the optical system and an original film in the enlarger, setting means for manually setting a preliminary desired amount of light to be emitted from the light source and calculation means for calculating an actually desired amount of flash light to be emitted from the light source for obtaining a desired total amount of the exposure light on the surface of the easel for making a suitable exposure on the printing paper to provide a best print.

REFERENCES:
patent: 3647296 (1972-03-01), Long
patent: 3702732 (1972-11-01), Sliwkowski
patent: 3724946 (1973-04-01), Knapp
patent: 3813158 (1974-05-01), Zahn
patent: 3825336 (1974-07-01), Reynolds
patent: 4167327 (1979-09-01), DiNatale

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