| 摘要 |
PURPOSE:To correct exposure for each photographing to obtain a suitable quantity of exposure at the time of multi-exposure by resetting a preset value when a shifted diaphragm or shutter second value exceeds the minimum diaphragm or the shortest second of a camera. CONSTITUTION:When a calculated iris value indicates a smaller value than the minimum diaphragm value of the camera, the output of an operational amplifier OP1 and the minimum diaphragm value are compared with a corresponding voltage VC3 by a comparator CP2, and when the output of the amplifier OP1 exceeds VC3, a switch AG is turned on by the output of the comparator CP2. Since a differential amplifier DEF indicates voltage corresponding to the difference between the reference voltage VC3 and the amplifier OP1, the difference signal is inputted to an amplifier OP4 through the switch AG and the output of the amplifier OP4 indicates a second time shorter than the second value set up in a VT1 by a value corresponding to the difference signal. Consequently, the preset second value is shifted, the shutter second is controlled by the shifted shutter second value and the exposing quantity is controlled so as to be the exposing quantity corrected by a set up correction value. |
