| 摘要 |
For a positive lens having a convex surface on an image side thereof and a diaphragm provided on an object side thereof, the following conditions are satisfied when a surface of the lens at least on the image side is aspheric, a focal length is f, a distance from the diaphragm to a front surface of the lens is D 0 , and a thickness of the lens is D 1 : 0.2<D 0 /f<0.8, 1.2<(D 0 +D 1 )/f, and 0.4<R 2 /f<1.0.
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