| 摘要 |
PROBLEM TO BE SOLVED: To reduce a burden to a hand shake correction driving system and to obtain excellent optical performance even when a large hand shake is generated by making a lens group comparatively light in weight a hand shake correcting group. SOLUTION: This zoom lens has five components of positive, negative, positive, positive and negative and hand shake correction is performed by making a third group Gr3 composed of a positive lens and a negative lense, eccentric in the perpendicular direction to an optical axis. The moving sensitivity of a hand shake correcting group for every focal distance in zooming is stipulated and the ratio of a final group to a focal distance at a wide-angle end (W) is stipulated. Namely, in this case, the following conditions are satisfied. 8<f/βr(1-βd)}<100, -0.8<flast/fw<-0.5, where (f) is the focal distance of a whole system,βr is the lateral magnification of all lens groups located on an image side closer than the hand shake correcting group,βd is the lateral magnification of the hand shake correcting group, flast is the focal distance of a final group and fw is the focal distance of the whole system at the wide-angle end.
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