Patent ID: 7965455

Claim:
An image pickup lens comprising, in order from an object side to an image side: an aperture stop; a first lens element having a positive refractive power; a second lens element having a negative refractive power and a biconcave shape; a third lens element having a positive refractive power and a meniscus shape whose concave surface faces the object side; and a fourth lens element having a negative refractive power, wherein the following conditional expressions are satisfied, 0.20 <f/|f 2|<0.76 ν d 1 −νd 2>25 where f denotes the focal length of the entire lens system, f 2 denotes the focal length of the second lens element, νdl denotes the Abbe number of the first lens element, and νd 2 denotes the Abbe number of the second lens element.