Zoom lens and image pickup apparatus including the same
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United States of America Patent
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Apr 12, 2016
Grant Date -
May 14, 2015
app pub date -
Oct 21, 2014
filing date -
Nov 12, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A zoom lens includes, in order from an object side: a positive first lens unit that does not move for zooming and comprises a negative first sub-lens unit, a positive second sub-lens unit that moves during adjustment of a focal point, and a positive third sub-lens unit composed of at least one negative lens, and at least two positive lenses; a lens group including at least two lens units that move during zooming; an aperture stop; and a positive last lens unit that does not move for zooming. Focal lengths of the first lens unit, the first sub-lens unit, and the zoom lens at a wide angle end, imaging magnification of the last lens unit, average values of an Abbe constant for d-line of the at least one negative lens and of the at least two positive lenses are appropriately set.
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