To provide a small and lightweight zoom lens system which has small aberration variation accompanying focusing, sufficiently corrects various aberrations in a proximity object focusing state in particular, and superior in optical performance in the whole focusing state, and to provide an interchangeable lens device including the zoom lens system, and a camera system.
The zoom lens system having a plurality of lens groups constituted of at least one lens element has at least three moving lens groups independently moving along an optical axis in zooming from a wide angle end to a far end in imaging, and fixes the lens groups arranged closest to the object side to an image face in zooming. In the zoom lens system, the whole moving lens groups are focusing lens groups moving along the optical axis in at least one zooming position in the far end from the wide angle end in focusing from an infinity focusing state to the proximity object focusing state. The interchangeable lens device and the camera system are provided.
MIYAZAKI KYOICHI
Kaoru Kuwahara
Takeji Takada