| 主权项 |
1. A zoom lens, consisting of:
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 first lens group, the second lens group, and the third lens group provided in first to third order from an object side, the first lens group, the second lens group, and the third lens group configured to move during an operation wherein the zoom lens changes magnification; the first lens group, the second lens group, and the third lens group each being moveable such that a distance between the first lens group and the second lens group is greater, and a distance between the second lens group and the third lens group is smaller, at a telephoto end compared to a wide angle end; the third lens group comprising a plurality of lenses, and distances among the plurality of lenses provided in the third lens group being constant while changing magnification; the third lens group consisting of a 3-1 lens group having a positive refractive power and a 3-2 lens group, provided in this order from the object side; the 3-1 lens group being fixed when camera shake occurs and during focusing operations; and the 3-2 lens group comprising a shake preventing lens group provided most toward the object side that moves in a direction perpendicular to an optical axis when camera shake occurs to correct an imaging plane but is fixed during focusing operations, and a focusing lens group provided more toward an image side than the shake preventing lens group that moves along the optical axis during focusing operations but is fixed when camera shake occurs; wherein the focusing lens group has a positive refractive power; and wherein a lens group having a negative refractive power, which is fixed during focusing operations and when camera shake occurs, is provided adjacent to the focusing lens group toward the image side thereof. |
