Candlelight at the scene of video shooting also automatically adjusts the circuit at noon

摘要

An automatic control circuit of the depth of focus of a video shooting apparatus for automatically controlling the depth of focus in control of a shutter speed on centerfocusing comprises a switch for switching on the state of the established centerfocus if a control command of centerfocus is applied by a user, a microcomputer for outputting the control signal of the shutter speed to a shutter selector if the state of the established centerfocus is received, a sample and hold circuit for sampling and holding an image signal of an image element controlled by the shutter speed selected from the shutter selector, and a level detection for detector the level of the shutter speed provided by the sample and hold circuit to control the operation of the microcomputer.