Patent ID: 11906717
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. The zoom lens system of claim 1, wherein
when a lens group located closer to the image plane than any other lens group of the at least six lens groups is called an Nth lens group, another lens group located adjacent to, and closer to an object than, the Nth lens group is called an (N−1th lens group, and still another lens group located adjacent to, and closer to the object than, the (N−1th lens group is called an (N−2)th lens group,
while the zoom lens system is focusing to make a transition from an infinity in-focus state toward a close-object in-focus state, at least the (N−2th lens group moves along an optical axis of the zoom lens system, and
the zoom lens system satisfies a condition expressed by the following inequality:

−1.5<fGN−1/fGN<−0.5, where fGN−1 is a focal length of the (N−1)th lens group and fGN is a focal length of the Nth lens group.