| 摘要 |
PURPOSE:To reduce a photometric error, by controlling a photometric start time for controlling an exposure by AND of a photometric quantity low level signal and a delay signal from release, and starting the photometry by making it synchronize with opening of a shutter. CONSTITUTION:When a sector is opened by shutter release, a photodetector PD is doused temporarily, an output of an operational amplifier OP drops, a transistor T5 is turned on, and an invertor G3 becomes an H output. On the other hand, when a release switch SW2 is closed, a timer C2 and R1 start an operation, and after a prescribed time has passed, an invertor G4 becomes an L output. When the invertors G3, G4 become H and L, respectively, a flip-flop FF is set, a transistor T2 is turned off, photometric integration is started, and when an integral value reaches a prescribed value, an electromagnet Mg is demagnetized and the shutter is closed. |
