Photographisches System mit filmtypabhängiger Belichtungsmessung an der Filmoberfläche

摘要

Off-the-film metering in a photographic film camera is improved by measuring actual film reflectivity at the time of film manufacture and recording a film adjusted exposure constant on a magnetic recording layer on the film. Camera apparatus (50,52) is provided to read this film adjusted exposure constant value and generate (54) an adjustable reference level representative of actual film reflectivity which is then used in conjunction off-the-film metering apparatus (44,56) to control exposure of the film in accordance with actual film reflectivity values rather than a fixed or assumed value. Measured film exposure aim may also be recorded at film production and used to control film exposure in the camera.