Zoom lens and image pickup apparatus having the same
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United States of America Patent
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Aug 16, 2016
Grant Date -
Aug 20, 2015
app pub date -
Feb 10, 2015
filing date -
Feb 17, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens comprising, in order from the object side to the image side, a first lens unit having a positive refractive power which does not move for zooming, a plurality of lens units which move during zooming, and a rear lens unit having a positive refractive power which does not move for zooming, wherein the refractive index, the Abbe constant, the partial dispersion ratio and the focal length of the positive lens located closest to the image side among the positive lenses in the first lens unit and the focal length of the first lens unit, the focal length of the positive lens located closest to the image side among the positive lenses in the first lens unit, and the focal length of the first lens unit are appropriately set.
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