Zoom lens with high optical performance and image pickup apparatus having the same
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United States of America Patent
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Mar 24, 2015
Grant Date -
Aug 1, 2013
app pub date -
Mar 14, 2013
filing date -
May 26, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens comprises a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a rear group including at least two lens units and having a positive refractive power as a whole, in order from an object side to an image side. An interval of each of the lens units changes in a zoom operation, the rear group includes a lens unit R having a positive refractive power at the most image side, the lens unit R includes a lens having a concave surface at the image side and having an aspherical surface shape where a negative refractive power becomes stronger with increasing distance from an optical axis, and focal lengths f1, fR, and fw of the first lens unit, the lens unit R, and a whole system at a wide-angle end, respectively, are appropriately set.
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