Patent ID: 7843651

Claim:
A wide-angle lens system comprises a negative first lens group, a negative second lens group and a positive third lens group, in this order from an object, wherein said negative first lens group comprises a negative meniscus lens element having the convex surface facing toward the object, and a positive lens element having a convex surface facing toward the object, in this order from the object; wherein said negative first lens group comprises at least one aspherical surface; wherein said negative second lens group comprises a negative meniscus lens element having the convex surface facing toward the object, and cemented lens elements having a positive lens element and a negative lens element, in this order from the object; wherein said positive third lens group comprises cemented lens elements having a negative lens element and a positive lens element, and a positive lens element having a convex surface facing toward the image, in this order from the object; and wherein said wide-angle lens system satisfies following conditions: 1.30< f 3/ f< 1.70 −13.50< f 2/ f<− 3.80 wherein f designates the focal length of the entire lens system; f 2 designates the combined focal length of said negative second lens group; and f 3 designates the combined focal length of said positive third lens group.