Zoom lens system having a camera shake compensating function

摘要

A zoom lens system includes from the object side a first lens unit of a positive refractive power, a second lens unit of a positive refractive power, an aperture stop and a third lens unit of a negative refractive power. The second lens unit includes a front lens unit of a negative refractive power and a rear lens unit of a positive refractive power. In zooming from the shorter focal length side to the longer focal length side, the distance between the first and second lens units increases and the distance between the second and third lens units varies. Camera shake is compensated for by parallel decentering the entire second lens unit.