Patent ID: 8229292

Claim:
An auto focus (AF) adjusting apparatus comprising: an imaging sensor configured to capture light transmitted through an imaging lens to generate an image signal; an AF estimation value calculating unit configured to calculate an AF estimation value with respect to a first frequency band by using the image signal; a focus lens driver configured to drive a focus lens of the imaging lens in an optical axis direction; a location detector configured to detect a location of the focus lens; a near optimum location calculating unit configured to calculate a near optimum location of the AF estimation value by using the location of the focus lens and the AF estimation value; a controller configured to control the focus lens to move to the near optimum location; and a storage unit configured to store optimum location error information for correcting a difference between a second frequency band for determining an optimum location of an image surface of the imaging lens and the first frequency band, wherein the controller is configured to obtain optimum location error information corresponding to the optimum location of the image surface of the imaging lens, and correct the near optimum location calculated by the near optimum location calculation unit by using the obtained optimum location error information.