| 摘要 |
A zoom lens system includes a plurality of lens groups (G1, G2, G3, G4) aligned on an optical axis. At least one of the lens groups (G2, G3) is moveable along the optical axis to perform zooming. A specified lens group (G1) includes a focusing lens group (G1b) which is moveable along the optical axis to perform focussing. In a normal photography mode, focusing is carried out from infinity through to a predetermined photographing distance by moving the focusing lens group in the optical axis direction. In a shifting mode, the zoom lens system shifts from the normal photography mode to a macro photography mode by moving a lens group (G1a) of the specified lens group other than the focusing lens group when focusing on an object at a photographing distance that is shorter than the predetermined photographing distance. When the zoom lens is in the macro photography mode, focusing is carried out from the predetermined photographing distance to a minimum photographing distance by moving the focusing lens group. |
