Zoom lens with forward-located aperture stop
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United States of America Patent
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Feb 2, 2016
Grant Date -
Sep 26, 2013
app pub date -
Mar 15, 2013
filing date -
Mar 25, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A zoom lens including, along an optical axis and in order from an object space to an image space: first lens group with negative power; an aperture stop; a second lens group with positive power; a third lens group with positive power; and a fourth lens group. The second and third lens groups and the aperture stop are axially movable for zooming. At least one lens element in the first lens group is moveable to provide for focusing. The aperture stop moves independently of the lens groups during zooming and has a clear aperture that changes size during zooming.
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