| 摘要 |
A zoom lens system including, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a negative refractive power; an aperture stop; and a fourth lens unit having a positive refractive power and including a front lens subunit and a rear lens subunit in which Abbe numbers of lenses in the rear lens subunit satisfy the following expression, 0.400<νm/(νrp−νrn)<0.630, whereνm represents the Abbe number of the material of a first positive lens having the largest dispersion of the positive lenses included in the rear lens subunit,νrp represents the average Abbe number of materials of positive lenses other than the first positive lens in the rear lens subunit, andνrn represents the average Abbe number of materials of negative lenses in the rear lens subunit.
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