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Abstract

A focus detection apparatus of an imaging apparatus includes an imaging optical system for forming a plurality of optical images with divided light fluxes that have passed through an imaging lens, on a plurality of photoelectric conversion elements. A viewing field mask is disposed more on a side of the photoelectric conversion elements than an expected imaging surface of an imaging lens, and determines contours of the optical images formed on a detection plane. A focus detection element includes focus detection regions each for detecting an optical image. A termination pixel disposed outside an optical image and a termination pixel disposed inside the optical image are provided in each of the focus detection regions. A control unit obtains data of adjustment values indicating effective ranges of the focus detection regions from a storage unit, performs focus detection for the imaging lens, and controls a focus adjustment operation.

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