| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner focus type ultra wide-angle zoom lens whose maximum viewing angle exceeds 100 deg. and whose zoom ratio is >=1.7 though a zoom system is the two-group zoom one constituted of a negative lens group and a positive lens group. SOLUTION: This zoom lens is constituted of a 1st lens group G1 having negative refractive power and a 2nd lens group G2 having positive refractive power in order from an object side. By changing a distance between the 1st and the 2nd lens groups G1 and G2, zooming is performed. The 2nd lens group G2 is provided with a 2nd lens group front group G2a having positive refractive power and a 2nd lens group rear group G2b having positive refractive power in order from the object side. By moving the front group G2a to an image surface side, focusing is performed and the zoom lens satisfies a specified conditional expression.
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