| 摘要 |
<p>PURPOSE:To eliminate the need for photometric integration of light passed through a subordinate stop by providing a detecting means for the opening extent of a stop shutter, a means which calculates the quantity of exposure at every time point on the basis of the detection output, and an integrating means for the quantity of exposure. CONSTITUTION:The stop shutter begins to be opened by an opening means and its opening extent F' is detected by the opening extent detecting means. The exposure quantity calculating means outputs the quantity DELTAT/(F')<2> at every point of time based upon the opening extent F' and a preset time interval DELTAT, and the integrating means integrates the quantity of exposure. An exposure quantity determining means receives subject brightness B and film sensntivity S to output a determined value 1/BS, and a decision means generates an output when said integral value coincides with the determined value, so that a shutter closing means operates.</p> |
