发明授权
US4521094A Aperture value control device utilizing frequency signal from flash unit for camera 失效
光圈值控制装置利用闪光灯相机的频率信号

Aperture value control device utilizing frequency signal from flash unit
for camera
摘要:
The aperture value in a camera having a flash unit is controlled by a frequency signal from the flash unit. The frequency of the signal is variable in accordance with the light emission characteristics of the flash unit.
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