| 摘要 |
PURPOSE:To execute always optimum exposure to an image pickup element by executing the 1st exposure on the basis of an output from a light receiving element and executing the 2nd exposure on the basis of an output from the image pickup element obtained by the 1st exposure. CONSTITUTION:When a release switch 109 is depressed, an exposure control circuit 202 inputs the output of the light receiving element 107, measures the reflected luminance of a subject and calculates an exposure value to be applied to the image pickup element. Then, the circuit 202 selects an iris value and a shutter speed to apply the exposure value and drives a lens shutter 201. After completing the 1st exposure, a driving circuit 203 is actuated and an electrostatic image accumulated in the element 105 by the 1st exposure is outputted as an electric signal. The circuit 202 inputs the output of the element 105 and compares the input with a previously set pattern for optimum exposure. On the basis of the compared result, the 2nd exposure value is calculated by correcting the 1st exposure value and, an iris value and a shutter speed to apply the exposure value are selected and the 1st shutter 201 is driven. |
