| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical system that can sufficiently correct a variety of aberrations including chromatic aberration, that can be easily fabricated, and that has an excellent resistance to the surrounding environment, and an optical apparatus including the optical system. SOLUTION: In the optical system, when a point at which an optical axis and a pupil paraxial ray intersect is defined as P, the maximum value of heights from the optical axis where the paraxial marginal ray passes through the face of a lens on the enlargement side of the point P is greater than that from the optical axis where the paraxial marginal ray passes through the face of a lens on the reduction side of the point P. The optical system includes first and second optical elements, each of which is composed of a solid material having a refractive light incident surface and a refractive light exiting surface, on at least one of the enlargement side and the reduction side from the point P. The optical system satisfies conditionsΔθgF1>0.0272,ΔθgF2<-0.0278 andϕ1×ϕ2<0 whereΔθgF1 andΔθgF2 denote anomalous partial dispersion values of the solid material of the first and second optical elements for the g-line and F-line, respectively, andϕ1 andϕ2 denote refractive power of the first and second optical elements, respectively, when the light incident surfaces and the light exiting surfaces of the first and second optical elements are in contact with air. COPYRIGHT: (C)2008,JPO&INPIT
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