| 摘要 |
An exemplary wide-angle lens includes, in this order from the object side to the image side thereof, a first lens having negative refraction of power, a second lens having positive refraction of power, a third lens 30 having positive refraction of power, and a fourth lens having negative refraction of power, wherein the wide-angle lens satisfies the formulas: R1>R2>0, R1/R2>4.5, R8<R7<0, and 2<|R8/R7|<2.25, where R1 is the radius of curvature of the object-side surface of the first lens, R2 is the radius of curvature of the image-side surface of the first lens, R7 is the radius of curvature of the object-side surface of the fourth lens, and R8 is the radius of curvature of the image-side surface of the fourth lens.
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