| 摘要 |
At least one exemplary embodiment is directed to a zoom lens system having a telephoto-type configuration at the telephoto end. When assuming that an Abbe number is vd, and a partial dispersion ratio is thetagF, this zoom lens system includes a refractive optical element having positive refracting power made up of a solid material that can satisfy the following conditions: <?in-line-formulae description="In-line Formulae" end="lead"?>-2.100x10<SUP>-3</SUP>.vd+0.693<thetagF <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.555<thetagF<0.9 <?in-line-formulae description="In-line Formulae" end="tail"?> Thus, facilitating the configuration of a zoom lens system capable of appropriately correcting and/or reducing various aberrations, including a chromatic aberration straddling the entire zoom area.
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