Imaging device, adjustment method, and adjustment program

An imaging device that is disposed on an image side of another optical system, the imaging device comprising:

• a multispectral camera that acquires images in a plurality of wavelength ranges;
• a field lens that relays the other optical system to the multispectral camera;
• and
• an adjustment mechanism that adjusts a conjugate relationship between an emission pupil position of the other optical system and an incident pupil position of the multispectral camera, based on light and darkness information of the images,
• wherein the multispectral camera includes
• a wavelength polarizing filter unit including
• a frame which is disposed at a pupil position or near the pupil position and includes a plurality of aperture regions and in which centroids of the plurality of aperture regions are different from each other,
• a plurality of optical filters that are arranged in the plurality of aperture regions and include two or more optical filters transmitting lights having at least a part of wavelength ranges different from each other, and
• a plurality of polarizing filters that are arranged in the plurality of aperture regions and have different polarization directions,
• an imaging element that includes a plurality of pixel groups receiving light transmitted through any of the plurality of aperture regions, and
• a processor that generates an image on the basis of a plurality of image signals output from the imaging element.