| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a compact and standard zoom lens having F number of substantially 2.8 and including a vibration control function. <P>SOLUTION: The zoom lens, in order from an object side, includes: a first lens group L1 having a positive refractive power; a second lens group L2 having a negative refractive power; and a rear group having a positive refractive power as a whole; and performs zooming while changing an interval between the respective lens groups. The zoom lens satisfies the following expressions: D1w<D1t, D2w>D2t, 2<f1/fT<4, 3.5<f1/SKw<8, and 0.32<(M2-M1)/(SKw×ft/fw)<0.5, wherein Diw and Dit are air intervals between the (i)th lens group and the (i)th+first lens group in a wide-angle end and a telephoto end respectively, fW and fT are focal lengths of the entire system in the wide-angle end and the telephoto end respectively, fi is a focal length of the first lens group, SKw is a back focus in the wide-angle end, and M1 and M2 are moving distances of the (i)th lens group when zooming from the wide-angle end to the telephoto end. <P>COPYRIGHT: (C)2012,JPO&INPIT |
