Patent ID: 8878962

Claim:
A zoom lens system comprising, sequentially from an object to an image: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, wherein an interval between the first lens group and the second lens group, an interval between the second lens group and the third lens group, and an interval between the third lens group and the fourth lens group change during zooming from a wide-mode to a tele-mode, wherein the first lens group comprises one negative lens and three positive lenses sequentially from the object to the image, wherein the zoom lens system satisfies a condition below: 0.8 f 13 /f 14 <1, and wherein f 13 denotes a focal length of a positive lens of the first lens group disposed second from the image to the object, and f 14 denotes a focal distance of a positive lens of the first lens group disposed closest to the image.