Zoom tracking auto focus controller of optical zoom camera and controlling method therefor

PURPOSE: A zoom tracking autofocus controller of an optical zoom camera and a control method thereof are provided to reduce errors of determining the distance to a subject even though the zoom magnification of a camera lens is rapidly changed, thereby preventing the camera lens from being out of focus. CONSTITUTION: A control method of a zoom tracking autofocus controller of an optical zoom camera includes the following steps of: determining whether a tele-key is inputted or not (S100); controlling a zoom lens to a tele-direction if the tele-key is inputted (S200); controlling the movement of the focus lens for zoom tracking (S300); controlling the zoom lens to a wide-direction if the tele-key is not inputted (S400); and determining the amount of the movement of the focus lens by using trace curve data (S500). [Reference numerals] (AA) Start; (S100) Is tele-key inputted?; (S200) Control a zoom lens(210) to a tele-direction; (S300) Control the movement of a focus lens(220); (S400) Step of controlling the zoom lens(210) in a wide direction; (S500) Step of determining the amount of the movement of the focus lens by using trace curve data