使用过家用摄像机的朋友会发现,当被拍摄的主体在杂乱画面中时(如前后左右都有物体),摄像机的自动聚焦系统往往不能对想要拍摄的主体聚焦。另外,在画面中被拍摄主体与其它物体进行不规则运动时(如中距离拍摄球赛),摄像机的自动聚焦系统有局限性,不能在杂乱的环境中选出被摄 Friends who have used a home camcorder will find that the camera’s autofocus system often can not focus on the subject that they want to shoot when the subject being photographed is in a messy scene (such as objects around and behind). In addition, when the subject is subject to irregular movement with other objects on the screen (eg, mid-range shooting game), there is a limitation in the autofocus system of the camera and the camera can not be selected in a cluttered environment