| 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: i) 1.2≰Fnow≰2.2; ii) 2.5<ft/fw≰3; and iii) BFL≧6 mm, where 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. |
