Patent ID: 8570664

Claim:
A zoom lens system, in order from an object-side to an image-side thereof, comprising: a first lens group of negative refractive power, the first lens group comprising, in the order from the object-side to the image-side of the zoom lens system, a first lens of negative refractive power and a second lens of positive refractive power; a second lens group of positive refractive power, the second lens group comprising, in the order from the object-side to the image-side of the zoom lens system, a third lens of positive refractive power, a fourth lens of positive refractive power, a fifth lens of negative refractive power, and a sixth lens of negative refractive power; and a third lens group of positive refractive power; the zoom lens system satisfying the following condition formulas: 0.78 <|f 2 /f 1|<0.91, and 0.72 <L 2 /fT< 0.87, where f 1 represents an effective focal length of the first lens group, f 2 represents an effective focal length of the second lens group, L 2 is a displacement of the second lens group when the zoom lens system varies from a wide-angle state to a telephoto state, and fT represents an effective focal length of the zoom lens system which is in the telephoto state.