| 摘要 |
An image pickup apparatus comprises a sharpness extracting circuit for generating a sharpness signal corresponding to a degree of focus from a video signal generated by photoelectric conversion of a subject image inputted via a focus adjusting lens group, a state-of-focus determining circuit for determining whether the focus adjusting lens group is in focus, on the basis of the sharpness signal, a focusing circuit for performing a focusing operation to move the focus adjusting lens group along an optical axis, and a focusing restarting circuit for restarting the focusing operation of the focusing circuit when a parameter obtained when the focus adjusting lens group is in focus and a current parameter differ from each other. Since AF control and program-mode control are controlled in an interlocked manner, it is possible to effectively prevent defocusing which occurs if these controls are independently performed.
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