| 摘要 |
PURPOSE:To obtain an appropriate light quantity by producing and resetting a detecting output each time exposure quantity reaches a prescribed value, regarding the length of time when the number of producing times reaches a first prescribed value as a total exposing time, exposing by a second prescribed value less than that, and then flashing and exposing in the rest of time. CONSTITUTION:A photometric IC 100 obtains a photoelectric converted output corresponding to incident light quantity in condition where exposure is measured at open aperture. A photometric block 210 in a gate array 200 reacts and counts that; and then a photometric microcomputer 300 calculates a value for the incident light quantity as well as corresponding shatter speed and diaphragm based on the counted value. A microcomputer 400 for system control generates a signal regarding the shatter speed and diaphragm when receiving the calculated value. A photometric microcomputer 300 monitors the counted output of the gate array 200 and repeatedly alters counting conditions when overflow has occurred. On pressing a switch in a switch circuit 410, the microcomputer 400 commands the microcomputer 300 to switch to exposure control action so that a specified exposure action is performed. Even in exposing with flashing, this organization supplements exposure deficiency of other objects at the same time it maintains an appropriate light quantity for a main object. |
