| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens that is telephoto, compact, and lightweight and has small aberration fluctuation due to focus adjustment.SOLUTION: A zoom lens comprises, in order form an object side to an image side: a first lens group having positive refractive power that does not move for zooming; a second lens group having negative refractive power that moves when zooming; one or more lens groups that move when zooming; an aperture diaphragm; and an image forming lens group. The first lens group is composed of three or more sub lens groups including an eleventh lens group having positive refractive power arranged closest to the object side and a first k lens group having negative refractive power arranged closest to the image side. At least two sub lens groups of the three or more sub lens groups move during focus adjustment. |
