| 摘要 |
A lens system includes a positive refractive power first lens, a positive refractive power second lens, and a negative refractive power third lens in that order from the object side of the lens system. Wherein the lens system satisfies the following conditions: (1) 0.25<R1F/F<0.5; (2) R2F<R2R<0; and (3) 0<R1F<R1R, wherein, R1R is the radius of curvature of a surface of the first lens facing the image side of the lens system, R1F is the radius of curvature of the surface of the first lens facing the object side of the lens system, R2R is the radius of curvature of a surface of the second lens facing the image side of the lens system, R2F is the radius of curvature of the surface of the second lens facing the object side of the lens system, and F is a focal length of the lens system.
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