| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens which is compact and bright in the entire zoom range while having high magnification, and which has high optical performance and responds to demands for sufficient increase of an imaging angle and for short-distance imaging.SOLUTION: The zoom lens comprises at least, successively from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. The third lens group is constituted by disposing, successively from the object side, a first positive lens, a cemented lens including a second positive lens and a first negative lens, a third positive lens, a fourth positive lens, and a second negative lens. |
