| 摘要 |
A lens system comprises, on a side closest to an object, a first lens component having a positive refractive power and a second lens component having a positive refractive power in order from the object; and on a side closest to an image, a cemented lens constructed by cementing together a positive lens and a negative lens in order from the object; wherein the lens system satisfies the following conditional expressions: (n1+n2)/2>1.49 (nu1+nu2)/2>60 where n1 and nu1 denote a refractive index and an Abbe number of the first lens component at d-line, respectively, and n2 and nu2 denote a refractive index and an Abbe number of the second lens component at d-line, respectively.
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