Title: Camera with optionally operable manual controls

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Abstract: A single lens reflex camera which measures internally-received light and which has a circuit for automatically determining exposure time and including a capacitor which stores an electrical quantity corresponding to the amount of received light, this capacitor being connected to a light-measuring device through an automatic switch. The latter switch normally opens automatically in connection with swinging up of the mirror of the camera just prior to exposure so that the capacitor will store an electrical quantity corresponding to the measured light. The operator of the camera can optionally operate a manually operable structure for manually opening the latter switch, and this manually operable structure may also be connected with a power switch closed in order to render the automatic circuit operative just prior to manual opening of the switch connected to the memory capacitor, an additional power switch being provided as is conventional to be operated by manipulation of the shutter-tripping plunger. In addition it is possible to utilize the manual controls for swinging the mirror up to an exposure position just subsequent to the manual opening of the switch connected to the capacitor, and either of these structures for manual swinging up of mirror and closing of the additional power switch may be used separately without the other.


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