Photometric apparatus for single lens reflex camera

A photographic camera comprising:

• a housing;
• an objective lens mounted on said housing;
• a first shutter blind for initiating exposure of a light sensitive film and having a light reflective surface facing said objective lens;
• a second shutter blind for terminating said exposure;
• a photoelectric transducer element mounted in said camera at a location which permits said transducer element to receive light reflected from said first shutter blind light reflecting surface and/or said film;
• a capacitive network;
• first means cooperating with said transducer element for causing a charging current to flow through said capacitive network in response to the initiation of a shutter release operation whereby the charge across said capacitive network changes as a function of both said charging current and the effective time constant of said capacitive network;
• said capacitive network including second means responsive to movement of said first shutter blind across said film for modifying the effective time constant of said capacitive network an amount sufficient to compensate for changes in the magnitude of said charging current resulting from differences in the coefficients of reflectivity of said first blind reflective surface and said film;
• third means for causing said second shutter blind to terminate said exposure when the charge across said capacitive network reaches a predetermined value.