| 摘要 |
A focus detection apparatus comprises: an image sensor that receives images that are formed by light that passes through different pupil regions of a photographing optical system including a focus lens, and outputs a pair of image signals; a control unit that controls to acquire a pair of image signals from the image sensor at first and second lens positions of the focus lens; a conversion unit that, by multiplying a shift amount between a pair of images representing the pair of image signals by a conversion coefficient, converts the shift amount to a defocus amount; and a calculation unit that calculates the conversion coefficient based on displacement amounts of respective ones of the pair of images representing the pair of image signals acquired at the first and second lens positions, and a displacement amount of the focus lens from the first lens position to the second lens position.
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