| http://www.w3.org/ns/prov#value | - Assuming that a Z-axis is an optical axis defined by a straight line along which an axial principal ray passing through the center of a pupil of the image-forming optical system from the object side thereof and reaching the center of the image-formation position of the image pickup device travels until it intersects the first surface of the image-forming optical system, and that an axis perpendicu
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