Automatic focussing camera automatically moving lens

摘要

The focus detecting appts. comprises an optical system having a group of focusing lenses. An object distance measuring device measures the amt. of defocus for a specific object imaged by the focusing optical system. A focus judging device judges the focusing state in accordance with the measurement of the object distance measuring device. A lens driving device drives the focusing lens group to a focal position in which the specific object is in focus, in accordance with the amt. of defocus. A control device repeatedly operates the object distance measuring device and the lens driving device. A moving object judging device judges that the specific object is a moving object when the focus judging means judges the out-of-focus state more than one time during the repeated operations.