ZOOM LENS AND IMAGING APPARATUS
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United States of America Patent
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Issued Date -
Aug 27, 2015
app pub date -
Feb 23, 2015
filing date -
Feb 26, 2014
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Abandoned
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Abstract
A zoom lens essentially consists of positive first lens group, negative second lens group, negative third lens group, negative fourth lens group, and positive fifth lens group in this order from an object side. First and fifth lens groups are fixed with respect to an image plane, and second through fourth lens groups move in such a manner that a distance from each other changes when magnification is changed from a wide angle end to a telephoto end. First lens group essentially consists of 11th lens group having negative refractive power, 12th lens group having positive refractive power, and 13th lens group having positive refractive power in this order from the object side. 11th and 13th lens groups are fixed with respect to the image plane and 12th lens group moves during focusing. Further, the following conditional expression (1) is satisfied:
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