Patent ID: 7411746

Claim:
A wide-angle lens system comprises a negative front lens group, a diaphragm and a positive rear lens group, in this order from an object, wherein said negative front lens group comprises a negative first sub-lens group and a positive second sub-lens group, in this order from the object; wherein said positive rear lens group comprises cemented lens elements having a positive lens element, a negative lens element and a positive lens element; and wherein said wide-angle lens system satisfies the following conditions: −0.8< fla/flb<− 0.2 0.7< f/fR< 1.1 wherein fla designates the focal length of said negative first sub-lens group; flb designates the focal length of said positive second sub-lens group; f designates the focal length of the entire wide-angle lens system; and fR designates the focal length of said positive rear lens group.