Patent ID: 8537268

Claim:
A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having positive optical power, and a fourth lens unit having positive optical power, wherein in zooming, the intervals between the respective lens units vary, wherein the third lens unit comprises a plurality of lens elements, and wherein the following condition (I-1) is satisfied: 0.47< |f 31 /f G3 |<1.00 (I-1) (here, f T /f W >2.0) where, f 31 is a focal length of a most object side lens element in the third lens unit, f G3 is a focal length of the third lens unit, f T is a focal length of the entire system at a telephoto limit, and f W is a focal length of the entire system at a wide-angle limit.