Importance

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Abstract

A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, at least the first, third and fifth lens groups move in the optical axis direction. The second lens group includes at least four lens elements. Each of the third, fourth and fifth lens groups includes a plurality of lens elements. The following conditions (1) and (2) are satisfied:

description='In-line Formulae' end='lead'1.60<f1/f5<2.46   (1), anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'−2.46<f4/f3<−1.80   (2),description='In-line Formulae' end='tail'

wherein f1, f3, f4 and f5 designate the focal lengths of the first, third, fourth and fifth lens groups, respectively.

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First Claim