Zoom lens system
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United States of America Patent
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Feb 6, 2018
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N/A
app pub date -
Jul 3, 2013
filing date -
Jan 3, 2013
priority date (Note) -
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Abstract
A zoom lens system including, in an order from an object to an image: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, wherein zooming is performed by changing intervals between the first through fourth lens groups, and a lens included in the fourth lens group satisfies:
wherein vd_10 denotes an Abbe number of a line d of the lens included in the fourth lens group.
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