Patent ID: 8520316

Claim:
A wide-angle zoom lens system for imaging an object at an object side on an image surface at an image side, in the order from the object side to the image side, the wide-angle zoom lens system comprising: a first lens group with negative refraction power; a second lens group with positive refraction power; and a third lens group with positive refraction power; wherein during the focusing process, the first lens group, the second lens group, and the third lens group move along an optical axis of the wide-angle zoom lens system; the wide-angle zoom lens system satisfies the formulas: 0.77 <|f 2/ f 1|<1.1; 0.7< L 2 /f T <1.08; and 0.7< T 2/ IH< 1.1; wherein f1 is an effective focal length of the first lens group, f2 is an effective focal length of the second lens group, L2 is a distance of the second lens group moving from a wide-angle state to a telephoto state, fT is an effective focal length of the wide-angle zoom lens system in the telephoto state, T2 is a thickness of the second lens group along the optical axis of the wide-angle zoom lens system, and IH is a diagonal distance of the image surface.