Patent ID: 6597513
Filing Date: 2003-07-22
Classification: G02B

Abstract:
A zoom lens system comprising a negative first lens group, a positive second lens group, and a positive third lens group, in this order from an object,wherein zooming is performed by moving said first to third lens groups respectively along the optical axis; and wherein said zoomlens system satisfies the following conditions: 32.01.05whereinfw designates the focal length of the entire the zoom lens system at the short focal length extremity; f1 designates the focal length of said first lens group; f2 designates the focal length of said second lens group; f3 designates the focal length of said third lens group; m3w designates the magnification of said third lens group at the short focal length extremity, when an object at infinity is in an in-focus state; m3t designates the magnification of said third lens group at the long focal length extremity, when an object at infinity is in an in-focus state.