Imaging apparatus and method

An imaging apparatus comprising:

• a photoelectric conversion portion including a plurality of pixel units that convert light incident on the photoelectric conversion portion into a plurality of electrical signals;
• a light guide unit adjacent the photoelectric conversion portion, the light guide unit including a plurality of apertures through which light is guided to the plurality of pixel units in the photoelectric conversion portion;
• and
• a signal processing unit which processes the plurality of electric signals,
• wherein,
• one pixel unit generates a corresponding electrical signal from light guided to the pixel unit through more than one aperture arranged along same surface of the light guide unit,
• the apertures include at least one aperture having a lens and at least one aperture having no lens,
• the apertures include at least a first aperture and a second aperture each having (i) a first opening through which light enters the aperture, the first opening being on a side of a subject being imaged, and (ii) a second opening through which light exits the aperture, the second opening being on a side of the photoelectric conversion portion, the first and second openings being of different sizes, and
• the first opening of the first aperture is smaller in diameter than the second opening of the first aperture, and the first opening of the second aperture is larger in diameter than the second opening of the second aperture.