| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens that excellently corrects an aberration fluctuation upon correction of an image tremor even at a high zoom ratio, and can achieve a high optical performance upon an anti-tremor.SOLUTION: A zoom lens comprises, in order from an object side to an image side,: a first lens group with positive refractive power; a second lens group with negative refractive power; a third lens group with positive refractive power; and a rear group that includes one or more lens groups. In the zoom lens in which a space between adjacent lens groups varies upon zooming, the second lens group is composed of a 2a group remaining unchanged upon correction of an image tremor, and a 2b group moving so as to have a component in a vertical direction relative to an optical axis upon the correction of the image tremor. The 2a group is composed of one positive lens G2ap, and one negative lens G2an in which a focal length f2a of the 2a group and a focal length f2 of the second lens group are appropriately set, respectively. |
