| 摘要 |
The invention relates to a zoom optical system that can offer an effective tradeoff between low cost and size reductions, and electronic equipment that incorporates the same. The zoom optical system comprises, in order from an object side thereof, a first lens group G 1 of negative refracting power, an aperture stop S, a second lens group G 2 of positive refracting power, a third lens group G 3 of negative refracting power and a fourth lens group G 4 of positive refracting power, and satisfies the following condition. <?in-line-formulae description="In-line Formulae" end="lead"?>2<|d<SUB>w12</SUB>-d<SUB>t12</SUB>|/|d<SUB>w23</SUB>-d<SUB>t23</SUB>|<200<?in-line-formulae description="In-line Formulae" end="tail"?> Here d<SUB>w12 </SUB>is a spacing between G 1 and G 2 at a wide-angle end, d<SUB>t12 </SUB>is a spacing between G 1 and G 2 at a telephoto end, d<SUB>w23 </SUB>is a spacing between G 2 and G 3 at the wide-angle end, and d<SUB>t23 </SUB>is a spacing between G 2 and G 3 at the telephoto end.
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