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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
G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
G03B13/18—Focusing aids
G03B13/24—Focusing screens
G03B13/26—Focusing screens with magnifiers for inspecting image formed on screen
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FR838545D1938-05-301938-05-30Procédé et dispositifs de mise au point dans les appareils photographiques ou cinématographiques
ExpiredFR838545A
(fr)
Système de commande unique de l'obturation et de l'avancement du film dans les appareils de prise de vues photographiques et cinématographiques