| 摘要 |
A two group zoom lens system of an inverted telephoto type is provided wherein a first lens group of a negative refractive power consisted of a first negative component and a second positive component of a positive meniscus lens convex to the object side; and a second lens group of a positive refractive power located with a variable air space between the first and second lens groups, consisting of third and fourth positive components, a fifth negative component, and a sixth positive component; wherein the shortest focal length of the whole lens system is less than the length of the diagonal line of the image plane; and wherein the lens system fulfills the following conditions; 2.3 fs<l<2.75 fs 0.55 fs< gamma 3<1.8 fs wherein, fs represents the shortest focal length of the whole lens system, l represents the axial distance between the object side surface of the first component and the image plane, and gamma 3 represents the radius of curvature of the object side surface of the second component.
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