| 摘要 |
PURPOSE:To increase the accuracy and to reduce the cost, by carrying out the switching between the photometric information and the setting information and then leading these information into a digital circuit via an A/D converter. CONSTITUTION:A photometric circuit MP measures the brightness of a subject and contains a temperature compensating circuit TS. A setting part includes volumes VR1 and VR2 that set the ASA and F value. The circuit TS flows the current proportional to the temperature to the volumes VR1 and VR2. An input changeover switch SW1 switches each information given from the circuit MP plus VR1 and VR2 and then sends it to an A/D converter AD. A digital arithmetic circuit DO calculates the photometric information and setting information which are successively supplied from the converter AD and then performs the exposure control. In such constitution, the accuracy can be increased and at the same time the reduction of cost can be realized since just a unit of A/D converter is used. |
