An imaging apparatus includes an image generating unit obtaining a first imaging signal or a second imaging signal from a first light-receiving element group or a second light-receiving element group of an image pickup device, respectively and generating a first image or a second image, and the first light-receiving element group and the second light-receiving element group of the image pickup device are configured to obtain a first image and a second image with different weights according to a first characteristic and a second characteristic, respectively, of a photographing optical system.