| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a zoom lens which has a high zoom ratio and a large aperture ratio, and achieves high optical performance all over the zoom area. Ž<P>SOLUTION: The zoom lens has a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power and a fifth lens group having positive refractive power in order from an object side to an image side, and performs zooming by varying intervals of the respective lens groups, wherein focal lengths fW and fT of the entire system at a wide angle end and a telephoto end, and focal lengths f2 and f3 of the second lens group and the third lens group are respectively properly set. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
