1. An imaging apparatus comprising: an imaging element that photoelectrically converts incident light so as to output an imaging signal; a stop that adjusts a light amount of the incident light; a photometric section that performs photometry on the basis of the imaging signal; an apodization filter that is disposed on an optical path of the incident light; a program diagram storage section that stores a first program diagram in which an aperture value is fixed at an open aperture value at a first amount of exposure or less and a second program diagram in which an aperture value is fixed at an open aperture value at a second amount of exposure, which is greater than the first amount of exposure, or less; a subject information acquisition section that acquires subject information on the basis of the imaging signal; and an imaging exposure determination section that selects the second program diagram in a case where the apodization filter is disposed on the optical path and the subject information satisfies a first condition, selects the first program diagram in a case where the apodization filter is not disposed on the optical path and a case where the apodization filter is disposed on the optical path and the subject information does not satisfy the first condition, and determines one group of an imaging aperture value and an imaging shutter speed, on the basis of an amount of imaging exposure which is calculated from a photometric value obtained by the photometric section.