Patent ID: 7031080

Claim:
A photographic lens comprising a first lens element, a second lens element disposed on image side of said first lens element, and a first stop disposed between said first and second lens elements, said first lens element being a meniscus lens having a convex object side surface, said second lens element being a double-convex lens, said photographic lens satisfying the following conditions: 5.6 ≦f< 8; F 1 >F 2 ; 0.39 <F/F 1 ≦0.5; 0.15 <R 1 /F< 0.19; 1.4<( F/R 3 )· f≦ 3.0; and R 3 >| R 4 | wherein F is an overall focal length of the photographic lens, F 1 is a focal length of said first lens element, F 2 is a focal length of said second lens element, f is a ratio of the overall focal length F to an effective aperture size that is defined by the first stop, R 1 is a radius of curvature of the object side surface of said first lens element, and R 3 and R 4 are radii of curvature of the object side spherical surface and of an average spherical surface of the image side aspherical surface of the second lens element respectively.