| 摘要 |
A zoom lens system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a subsequent lens-unit set including at least one lens units. Intervals between the lens units change during zooming. The first lens unit includes a negative lens element, an optical element, and a positive lens element. Various parameters are set appropriately, including the Abbe number nun and the partial dispersion ratio thetagF of a material composing the optical element, the focal length f1n of the negative lens element and the Abbe number nu1n of a material composing the negative lens element, the focal length f1 of the first lens unit, and respective lateral magnifications beta3iw and beta3it of the subsequent lens-unit set at a wide-angle end and at a telephoto end.
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