| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high magnification zoom lens having not only a reduced total weight but also a focusing group lens system with a reduced weight, which reduces a load on a focus drive system, and an anti-shake lens system having a smaller diameter and reduced weight, which reduces a load on an anti-shake drive system and allows for reducing size of the anti-shake drive system.SOLUTION: A high magnification zoom lens comprises, in order from the object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, and a fifth lens group. When shifting focus from an object at infinity to an object at a short distance, focusing is accomplished by moving the fourth lens group toward the image side. A lens having negative refractive power constituting the fourth lens group has at least one aspherical surface. The high magnification zoom lens satisfies a predefined conditional expression.</p> |
