| 摘要 |
A zoom lens system including, in an order from an object to an image: a first lens group having negative refractive power; and a second lens group having positive refractive power, wherein the zoom lens system satisfies equations below: 1.2≰Fnow≰2.2; 2.5<ft/fw≰3; and BFL≧6 mm, wherein Fnow denotes an F-number at a wide angle position, ft and fw, respectively denotes overall focal lengths at a telephoto position and the wide angle position, and BFL denotes a back focal length.
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