Zoom lens and image pickup apparatus having the same
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United States of America Patent
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Oct 28, 2014
Grant Date -
Feb 6, 2014
app pub date -
Jul 30, 2013
filing date -
Jul 31, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom lens includes first to third lens units having positive, negative, and positive refractive power, respectively, and a rear lens group having positive refractive power. An aperture stop is arranged between a lens surface of the second lens unit closest to the image side and a lens surface of the third lens unit closest to the image side. The third lens unit includes first and second positive lenses each including an aspheric surface, and a negative lens. In the third lens unit, a refractive index of the first positive lens, and an Abbe number and relative partial dispersion of the second positive lens are appropriately set.
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