Focus adjustment apparatus, control method of focus adjustment apparatus, and imaging apparatus

A control method of a focus adjustment apparatus including an imaging unit configured to convert light from an optical system to an electric signal by photoelectric conversion and output an image signal for imaging and a pair of parallax image signals in a focus detection area, wherein the control method comprises:

• a focus detection step of detecting a defocus amount using the pair of parallax image signals;
• a control step of controlling adjustment of a focus position of the optical system based on the defocus amount;
• a first determination step of determining whether the imaging unit is imaging a subject with a repetitive pattern in the focus detection area;
• a second determination step of determining whether the degree of image blurring is equal to or less than a predetermined degree of blurring using at least one of the image signal for imaging and the pair of parallax image signals, wherein
• at the control step, when it is determined at the first determination that the imaging unit is imaging the subject with the repetitive pattern in the focus detection area and it is determined at the second determination that a degree of image blurring is equal to or more than the predetermined degree of blurring, a focus lens in the optical system is moved to acquire a new defocus amount.