| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical system by which image formation performance is excellently maintained by combining a refractive optical device and a diffraction optical device, and to provide optical equipment using it. SOLUTION: This system possesses one or more diffraction optical devices in which a phase is not reversed from an optical axis to a peripheral part and the absolute value of power is made minimum in the vicinity of the optical axis. |
