Exposure time control circuitry for cameras

摘要

In an exposure time control circuit for a camera adapted for manual and automatic exposure control, the resistance of a single variable resistance element is varied by a first movable member moved in accordance with at least the setting of the film sensitivity and by a second movable member moved in accordance with the manually set exposure time. Switching means connect either the first or the second independently movable member into the time control circuit. A manually operable second switching means set to a first position produces a first output signal between a photoelectric element and the variable resistance and in a second position produces a second output signal formed between a fixed resistor and the variable resistance element.