Patent ID: 8605362

Claim:
A zoom lens system comprising, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having positive refractive power, upon zooming from a wide-angle end state to a telephoto end state, a position of the first lens group being fixed, at least a portion of any one of the lens groups being movable in a direction including a component perpendicular to an optical axis, and the following conditional expressions being satisfied: 5.20 <f 1/(− f 2)<8.00 0.50 <f 2 /f 4<0.85 where f 1 denotes a focal length of the first lens group, f 2 denotes a focal length of the second lens group, and f 4 denotes a focal length of the fourth lens group.