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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
G03B19/00—Cameras
G03B19/02—Still-picture cameras
G03B19/12—Reflex cameras with single objective and a movable reflector or a partly-transmitting mirror
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FR615993D1925-10-081925-10-08Dispositif de chambre claire pour redresser l'image projetée sur l'écran dépoli par l'objectif photographique
ExpiredFR615993A
(fr)
Dispositif indiquant, pour différents tirages de la chambre noire, la valeur réduite de l'intensité lumineuse des ouvertures d'un objectif photographique et divers autres facteurs