Patent ID: 8184289

Claim:
A spectral colorimetric apparatus for detecting a color of an image of a test subject illuminated, comprising: a stop; a spectral detection optical system for spectrally detecting a light beam which is diffused in the test subject and passes through the stop; and a guiding optical system for guiding, toward the stop, the light beam diffused in the test subject, wherein condensing positions of the light beam condensed by the guiding optical system change depending on a position in a direction orthogonal to a first section which is a section including an optical axis of the guiding optical system, wherein the stop is disposed between a condensing position closest to the guiding optical system and a condensing position farthest from the guiding optical system, of condensing positions, in the first section, of the light beam condensed by the guiding optical system, in a direction of the optical axis of the guiding optical system, and wherein in a second section orthogonal to the first section and parallel to the optical axis, the guiding optical system includes an anamorphic optical surface in which a power in the first section is larger than a power in the second section.