| 摘要 |
Provided is a zoom lens system including a compact focusing lens unit and having a suppressed change in image magnification at the time of movement of the focusing lens unit. A zoom lens system of the present invention, in order from an object side to an image side, includes, a first lens unit G1 having negative optical power, a second lens unit G2 having positive optical power, a third lens unit G3 having positive optical power, and a fourth lens G4. Condition (10): 1.4<DL/YM<2.5 and condition (11): 1.2<BFW/YM<1.6 are satisfied (where, 100<2ωW<140, DL is an effective diameter of the lens surface closest to the image side, BFW is the back focus at a wide-angle limit, YM is the maximum image height at a wide-angle limit, and ωW is a half view angle (°) at a wide-angle limit).
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