Auf eine äussere Informationsaussendevorrichtung reagierendes optisches Gerät

摘要

A camera controls its operation according to the data contents of a signal transmitted from an external information output device. The camera (52) includes a detector (21) for detecting the signal transmitted from the information output device (51), a switch for switching the detector to a detectable state, and a limitation unit for making the detector nonoperable irrespective of any state of the switch. Thus, a meaningless detection operation of the detector is limited.