IMAGE CAPTURING APPARATUS, IMAGE CAPTURING DEVICE, IMAGE CAPTURING METHOD, AND PROGRAM FOR PHASE DIFFERENCE DETECTION

Provided is an image-capturing apparatus including: an image-capturing device where pixels covered with first filters blocking light other than light in a first wavelength range among wavelength ranges obtained by two-dividing a specific wavelength range and second filters blocking light other than light in a second wavelength range are disposed based on a predetermined rule; a light-blocking filter being detachably disposed in an optical path of subject light toward the image-capturing device and blocking the light in the first wavelength range; a focus-alignment determination unit performing focus-alignment determination through phase-difference detection based on a signal generated by the image-capturing device when the light-blocking filter is inserted into the optical path; an image-generation unit generating an image based on a signal generated by the image-capturing device; and a controller controlling insertion/detachment of the light-blocking filter with respect to the optical path based on necessity of the focus-alignment determination.