Patent ID: 7221519

Claim:
A zoom lens system comprising: a frontmost first lens unit having a negative optical power, the first lens unit consisting of a negative lens element; and a plurality of lens units on the rear side of the first lens unit, wherein the distances between the adjacent lens units are changed in zooming, the zoom lens system including five or less lens elements in total, the zoom lens system satisfying the following conditions: 58<vd1 0.10 <|tkw/tlw|< 0.70 wherein vd 1 is the Abbe number of the material for the negative lens element, tkw is the distance from the rearmost lens surface to an exit pupil at a wide-angle end, and tlw is the total lens length of the zoom lens system at the wide-angle end, and wherein the following condition is additionally satisfied: 0.01<|( tlt−tlw )/ tlw|< 0.15 wherein tlt is the total lens length of the zoom lens system at a telephoto end.