| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fisheye lens that is improved in chromatic difference of magnification, regarding a fisheye lens system comprising, in order from an object side, a front group having a negative focal length and a rear group having a positive focal length with interposing a diaphragm between them, and having a viewing angle of 170°or above. SOLUTION: The fisheye lens comprises: in order from the object side, the front group having a negative lens component and three or more pairs of cemented lens components, and having the negative focal length as the whole; and the rear group having the positive focal length as the whole. At least one or more glasses of high anomalous dispersion are arranged in the rear group, and prescribed conditions are satisfied. COPYRIGHT: (C)2008,JPO&INPIT
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