Patent ID: 7570435

Claim:
A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having negative optical power and moving along an optical axis during zooming, the first lens unit, in order from the object side to the image side, having a negative lens element and a positive lens element with a convex surface facing the object side; a second lens unit having positive optical power and moving along an optical axis during zooming; and a third lens unit having positive optical power and moving along an optical axis during zooming, wherein the second lens unit has at least three lens elements, an object side surface of the most object side lens element that constitutes the second lens unit is aspheric, and the following condition (1) is satisfied: n12>1.88 (1) (here, 2ω W ≧67.94) where, n 12 is a refractive index of the positive lens element of the first lens unit, and 2ω W is a view angle at a wide-angle limit.