| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a zoom lens system capable of obtaining excellent imaging quality and promoting reduction in size of a camera. <P>SOLUTION: A zoom lens system 100 comprises, sequentially from an object side to an imaging surface: a first lens group 10 having positive refractive power and being fixed; a second lens group 20 having negative refractive power and movable along an optical axis of the zoom lens system; a third lens group 30 having positive refractive power and being fixed; a fourth lens group 40 having positive refractive power and movable along the optical axis of the zoom lens system; and a fifth lens group 50 having negative refractive power and being fixed. The fifth lens group 50 comprises, sequentially from the object side to the imaging surface, a lens L11 having negative refractive power and a lens L12 having positive refractive power. In the zoom lens system, the focal distance of the second lens group and a difference between Abbe numbers of the lens L11 and the lens L12 satisfy predetermined conditional formulas. <P>COPYRIGHT: (C)2012,JPO&INPIT |
