| 摘要 |
In order to provide a large relative-aperture super wide-angle lens having the inclusive angle of 2omega=115° or more with the conventional projection method (y=f.tan theta) having the relative-aperture of about F 2.8, having compactness and high optical performance, and having small variation of aberration in relatively closed object distance, the lens includes, in order from the object, a divergent lens group Gn having negative refractive power and a convergent lens group Gp having positive refractive power, and the divergent lens group Gp includes at least one aspherical negative lens, and the aspherical lens satisfies predetermined conditional expressions.
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