| 摘要 |
Providing a two-lens-group zoom lens system that has a wide angle of view, a fast aperture ratio with an f-number of about 2.8, a high zoom ratio, and high optical performance, and is easy to be manufactured. The zoom lens system is composed of, in order from an object, a first lens group G 1 having negative refractive power, and a second lens group G 2 having positive refractive power. Zooming is carried out by varying a distance between the first lens group G 1 and the second lens group G 2 . The second lens group G 2 includes, in order from the object, a first positive lens component L 1 , an aperture stop S, a second positive lens component L 2 , and a negative lens L 3 . Given conditional expression is satisfied.
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