autofokuseinrichtung with focus follow-up survey for objects in motion

摘要

An automatic focusing apparatus, capable of continuously keeping a main subject (144) in correct focus when the main subject (144) moves within a photographing screen (140) by detecting a focus state (best focus, front focus, back focus, blurring or the like) for each region in the photographing screen (140) and moving a main subject region to a region that is in best focus, is provided. A focus state is respectively detected for each region (140A) in the photographing screen (140) (step S16). Then, an AF frame (142) moves in accordance with the movement of a group of regions in best focus in the AF frame (142) (step S18), while automatic focusing is simultaneously performed so that a subject (144) in the AF frame (142) comes into best focus (step S20).