| 摘要 |
A zoom lens system that has a structure suitable to widen a field angle and realizes high optical performance over the entire zoom range is provided. The zoom lens system includes, in order from an object side to an image side, a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power. During zooming from a wide-angle end to a telephoto end, an axial interval between the first lens unit and the second lens unit reduces, an axial interval between the second lens unit and the third lens unit increases, and an axial interval between the third lens unit and the fourth lens unit reduces. In the zoom lens system, a back focus and refractive indices of the respective lens units are suitably set.
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