Patent ID: 7548385

Claim:
A wide-angle lens system comprises a negative first meniscus lens element having the convex surface facing toward an object, a positive second lens element, a positive third biconvex lens element, and a negative fourth meniscus lens element having the convex surface facing toward an image, in this order from the object; wherein said wide-angle lens system satisfies the following condition: 0.25< H /( p 3+ p 4)<0.60 wherein H designates the distance between the second principal point of said positive third biconvex lens element and the first principal point of said negative fourth meniscus lens element, when the focal length of the entire wide-angle lens system is normalized to 1.0; p 3 designates the refractive power of said positive third biconvex lens element when the focal length of the entire wide-angle lens system is normalized to 1.0; f 3 designates the focal length of said positive third biconvex lens element when the focal length of the entire wide-angle lens system is normalized to 1.0, i.e., p 3 =1/f 3 ; p 4 designates the refractive power of said negative fourth meniscus lens element when the focal length of the entire wide-angle lens system is normalized to 1.0; and f 4 designates the focal length of said negative fourth meniscus lens element wherein the focal length of the entire wide-angle lens system is normalized to 1.0, i.e., p 4 =1/f 4 .