| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens having a large aperture ratio and having high optical performance in an entire zoom range and in an entire object distance.SOLUTION: A zoom lens comprises, in order from an object side to an image side, a rear group including a first lens group having positive refractive power, a second lens group having negative refractive power, and a plurality of lens groups and having positive refractive power as a whole, and distances between adjacent lenses changes during zooming. The rear group has: a focus group having positive refractive power that moves during focusing and a subsequent group including one or more lens groups on the image side of the focus group. The subsequent group has negative refractive power at a telephoto end. A focal length ft of an entire system at the telephoto end and a composite focal length fpt from the first lens group to a lens group disposed on the object side of the focus group are each set appropriately.SELECTED DRAWING: Figure 1 |
