| 摘要 |
To provide an automatic focusing system which has an AF pickup device dedicated to an AF operation and which can perform the AF operation with high following ability to a moving subject. At the time of performing an AF control operation, a CPU of a lens unit sets a focusing state of a photographing optical system to an in-focus state by controlling a focus lens group FL of the photographing optical system so that an estimated focus value representing the magnitude of a contrast of a subject image is the maximum. The CPU adjusts an electronic shutter speed of the AF pickup device based on a brightness level of an image signal acquired by the AF pickup device and enhances the frame rate of the AF pickup device as high as possible.
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