| 摘要 |
A focal plane shutter camera includes leading and trailing curtains and a light responsive electronic timer and a mechanical timer which alternatively release the trailing curtain an interval after the release of the leading curtain. The mechanical timer is operative to release the trailing curtain a predetermined interval following the release of the leading curtain and when the full film plane is open, when a photoflash unit is coupled to the camera and the ambient light is inadequate for ordinary photography, or when the electronic timer current supply is deficient, and at other times the electronic timer controls the shutter speed. The mechanical timer may respond to the full discharge of the leading curtain advancing mechanism.
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