Zoom lens system

A zoom lens system comprising a positive first lens group, and a negative second lens group, in this order from an object,

• wherein zooming is performed by moving said positive first lens group and said negative second lens group in an optical axis direction;
• wherein said positive first lens group comprises a negative first lens element, a second lens element having an aspherical surface on which the curvature becomes smaller toward the periphery thereof, and a positive third lens element, in this order from said object;
• wherein said negative second lens group comprises a positive fourth lens group and a negative fifth lens group, in this order from said object;
• and
• wherein said zoom lens system satisfies the following conditions:
• −7<fT/f2G<−4.5
• −9<fT/f2GN<−7
• wherein
• fT designates the focal length of the entire zoom lens system at the long focal length extremity;
• f2G designates the focal length of said negative second lens group, and
• f2GN designates the focal length of said negative fifth lens group in said negative second lens group.