| 摘要 |
PROBLEM TO BE SOLVED: To obtain a zoom lens which has high optical performance all over the variable power range and consists of two lens groups and whose entire length is short, and optical equipment using the zoom lens. SOLUTION: This zoom lens is provided with a 1st lens group having positive refractive power and a 2nd lens group having negative refractive power in order from an object side. In the case of varying power from a wide angle end to a telephoto end, the respective lens groups are moved to the object side so that the 2nd lens group may approach to the 1st lens group, and the lens constitution of the 1st and the 2nd lens groups, the focal distance of an entire lens system at the wide angle end and the telephoto end and the focal distances of the 1st and the 2nd lens groups are appropriately set.
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