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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
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FR922946D1946-02-261946-02-26Procédé et dispositif pour la mise au point nette d'un appareil photographique ou cinématographique
ExpiredFR922946A
(fr)
Dispositif optique pour obtenir de l'objectif même d'un appareil photographique ou cinématographique une image réflétée non renversée, pour la mise au point et l'encadrement