| 摘要 |
A zoom lens system includes a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power and a fourth lens group having a positive refracting power. These lens groups are arranged in this order as viewed from an object. During zooming operation from the wide angle end to the telephoto end of the zoom lens system, the air space between the first and second lens groups increases and the air space between the third and fourth lens groups decreases. A focal length equal to the diagonal line of the effective image plane of the zoom lens system is included in the zooming range of the zoom lens system. The zoom lens system is formed so as to satisfy various conditions for making the zoom lens system small and giving a high zoom ratio.
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