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Priority to FR842957ApriorityCriticalpatent/FR1285254A/fr
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Publication of FR1285254ApublicationCriticalpatent/FR1285254A/fr
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
G03B7/28—Circuitry to measure or to take account of the object contrast
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Physics & Mathematics
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General Physics & Mathematics
(AREA)
FR842957A1960-11-041960-11-04Perfectionnements apportés aux appareils de mesure photo-électrique
ExpiredFR1285254A
(fr)