| 摘要 |
A focus detection device includes a light receiving element, an image shift detection unit, a movement detection unit, and a focus detection unit. The light receiving element receives a pair of light fluxes passing through different regions of a pupil of an optical system. The image shift detection unit detects an image shift amount caused by the pair of light fluxes, based on outputs of the pair of light fluxes received by the light receiving element. The movement detection unit detects an image movement amount caused by the optical system. The focus detection unit detects the focus adjustment state of the optical system by correcting the shift amount detected by the image shift detection unit, with the image movement amount detected by the movement detection unit.
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