| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact zoom lens having a wide angle of view and high optical performance over the entire zoom range.SOLUTION: The zoom lens comprises, in order from an object side to an image side: a first lens group L1 having positive refractive power; a second lens group L2 having negative refractive power; a third lens group L3 having positive refractive power; a fourth lens group L4 having negative refractive power; and a fifth lens group L5 having positive refractive power. During zooming, the distances between the lens groups are changed. The first lens group L1 comprises one negative lens and one positive lens. The entire optical length LDw of the zoom lens at the wide angle end, the entire optical length LDt of the zoom lens at the telephoto end, the focal length f1 of the first lens group L1, the focal length f2 of the second lens group L2, and the focal length f4 of the fourth lens group L4 are set to satisfy the following conditional expressions: 0.10<(LDt-LDw)/f1<0.31, and 0.70<f2/f4<1.20. |
