| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens for a lens shutter which has large variable power ratio. SOLUTION: The zoom lens has a 1st lens group with negative refracting power, a 2nd lens group with positive or negative refracting power, a 3rd lens group with positive or negative refracting power, a 4th lens group with positive refracting power, and a 5th lens group with negative refracting power in order from the object side. For power variation from a wide-angle side to a telephoto side, the 1st lens group and 5th lens group, and 2nd lens group and 4th lens group are moved together integrally on the optical axis to vary air gaps between the respective lens groups. COPYRIGHT: (C)2004,JPO
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