Patent ID: 7800842

Claim:
A photography lens comprising: an aperture stop; a first lens having positive refractive power, and at least one of lens surfaces is aspherical; a second lens having negative refractive power, and at least one of lens surfaces is aspherical; and a third lens having positive refractive power, and both lens surfaces are aspherical, arranged in that order from an object side to an image surface side, wherein the first lens is configured as a meniscus lens whose lens surface facing the object side is convex with higher refractive power than a lens surface facing the image surface side, a lens surface of the second lens facing the object side is concave, the third lens is configured as a meniscus lens whose lens surface facing the object side is convex, and when f indicates a focal length of an entire optical system, f1 indicates a focal length of the first lens, f2 indicates a focal length of the second lens, r21 indicates a radius of curvature of the lens surface of the second lens facing the object side, and n2 indicates a refractive index of the second lens, the following conditional expressions (1) to (3) are satisfied: 0.8 <f 1 /f< 0.9 (1) −1.0 <f 2 /f<− 0.7 (2) −1.0 <r 21/(( n 2−1)· f )<−0.7. (3)