Zoom lens and image pick-up apparatus having the same
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United States of America Patent
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Dec 8, 2015
Grant Date -
May 2, 2013
app pub date -
Oct 31, 2012
filing date -
Nov 1, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A zoom lens includes, in order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a negative refractive power, and a rear lens group including a plurality of lens units and having a positive refractive power as a whole. The distances between adjacent lens units are changed during zooming. The third lens unit is moved during focusing. The focal length, fw, of the entire zoom lens system at the wide-angle end; the focal length, ft, of the entire zoom lens system at the telephoto end; the combined focal length, f12w, of the first and second lens units at the wide-angle end; and the combined focal length, f12t, of the first and second lens units at the telephoto end are appropriately set to satisfy predetermined conditions.
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