| 摘要 |
A compact and lightweight zoom lens system having excellent imaging performance, which is favorably applicable to an interchangeable-lens type digital camera system, is provided. The zoom lens system of the present invention includes, a first lens unit having positive optical power and arranged closest to an object side, a focusing lens unit that moves along an optical axis from an infinity in-focus condition to a close-object in-focus condition, an image blur compensation sub-lens unit that includes at least one lens element and that moves in a direction perpendicular to the optical axis, and an aperture diaphragm arranged on an image side relative to the focusing lens unit and the image blur compensation sub-lens unit. The focusing lens unit, the image blur compensation sub-lens unit, and the aperture diaphragm are adjacent with one another. Further, the following condition (8) is satisfied: 0.7<BFW/fW<3.0 (BFW: a back focus of the entire system at a wide-angle limit, fW: a focal length of the entire system at a wide-angle limit) |
