| 摘要 |
At least one exemplary embodiment is directed to a zoom lens comprising a plurality of lens units, where the plurality of lens units have at least one negative lens including a first negative lens Gn1 arranged at a position where an effective diameter is minimized among negative lenses of the zoom lens, where when the at least one negative lens is represented by an i<SUP>th </SUP>negative lens Gni indicating the i<SUP>th </SUP>negative lens from an expansion side toward the reduction side and Xi=thetagFni-(0.6438-0.001682xnudni), the following condition is satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>(SigmaXixfni)/(Sigmafni)<-0.003,<?in-line-formulae description="In-line Formulae" end="tail"?> where the Abbe number and the partial dispersion ratio of the material of the i<SUP>th </SUP>negative lens Gni are nudni and thetagFni, respectively, and the focal length of the i<SUP>th </SUP>negative lens Gni is fni.
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