| 摘要 |
A zoom lens system includes, in order from an object side, a first lens unit G 1 having a positive refracting power, a second lens unit G 2 having a negative refracting power, a third lens unit G 3 having a positive refracting power, and a fourth lens unit G 4 having a positive refracting power, and at the time of zooming from a wide angle end to a telephoto end, a space between the lens units changes, and the second lens unit includes not more than three lenses, and a biconcave negative lens which satisfies the following conditional expression (1) is disposed nearest to the object side, in the second lens unit, and (the zoom lens system) is characterized by satisfying the following conditional expression (2). <?in-line-formulae description="In-line Formulae" end="lead"?>-0.1<SF<SUB>2n1</SUB><0.5 (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>3.0<f<SUB>t</SUB>/f<SUB>w</SUB><12.0 (2)<?in-line-formulae description="In-line Formulae" end="tail"?>
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