SHUTTER

PURPOSE:To obtain correct exposure by automatic exposure even in backlight, etc., by providing a photometry means for separately applying to the center part and the peripheral part of a field to be photographed, providing a sub- diaphragm for integrating light of the field to be photographed simultaneously with the exposure start and closing a shutter blade when the integrating value is at the exposure level set before the exposure. CONSTITUTION:A photodetector 4 fit in a light receiving opening 2b of a shutter base 2 is constituted of an SPD 5 subjected to photometry to the center part of the field to be photographed and an SPD 6 subjected to photometry to the peripheral part. On the leading part of the shutter blade 8, the sub-diaphragm 8 notched in a wedge form and a round opening 8c are formed. First, separate photometry using the photometry means 5 and 6 is performed before the exposure, then, the correct exposure level is calculated based on the photometry data. When a shutter button is released, the shutter blade 8 starts to open, the light of the field to be photographed is simultaneously integrated through the sub-diaphragm 8b, and when the integrated value reaches the exposure level, the shutter blade 8 is closed and the exposure is completed. Thus, the correct exposure is obtained by the automatic exposure even in the backlight.