Zoom lens system and image pickup apparatus including the same
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United States of America Patent
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Sep 23, 2014
Grant Date -
Jan 26, 2012
app pub date -
Jul 20, 2011
filing date -
Jul 26, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Provided is a zoom lens including a focus lens portion, a zoom portion, an aperture stop, and a relay portion that does not move for zooming but comprises a negative fourth-first unit, a fourth-second unit interchangeable for an optical path, a positive fourth-third unit, and a fourth-fourth unit inserteable for the optical path for shifting a focal length range of an entire system to a long focal length side after removing the fourth-second unit from the optical path, and a distance on an optical axis between the aperture stop and a last lens surface of the fourth-fourth unit in a state of inserting the fourth-fourth unit in the optical path, a distance on the optical axis between a first lens surface and the last lens surface of the fourth-fourth unit, and an aperture diameter in an opened state of the aperture stop satisfy a predetermined conditions.
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