| 摘要 |
A camera for receiving roll film having a leader portion with closer than normally spaced perforations and an exposure portion. A pawl is adapted to sense the perforation spacing. Should that perforation spacing be that of the leader, the camera's shutter release mechanism cannot be activated and the film advance mechanism may be operated to advance more film into the take-up chamber. However, should the pawl sense normally spaced perforations, the film advancing mechanism is disabled and the shutter release mechanism may be activated to take a picture. After the last exposure frame, the film is perforated at the shorter distance to permit running off of the trailer and is finally perforated at a position to prevent further film movement.
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