| 摘要 |
PROBLEM TO BE SOLVED: To provide a photographing optical system with which a sensitivity characteristics or the like of a solid-state imaging element are compensated and an excellent image quality is available with a simple structure. SOLUTION: The photographing optical system is provided with an aperture diaphragm 2, an interference type optical filter (for example, an infrared cut filter) 13 formed in the form of a curved plane of which center of radius is nearly located at the center of the aperture of the aperture diaphragm. The optical filter can be formed on the surface of a lens 1.
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