Zoom lens system

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<|f2/f1|<0.91, and
• 0.72<L2/fT<0.87,
• where f1 represents an effective focal length of the first lens group, f2 represents an effective focal length of the second lens group, L2 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.