ZOOM LENS SYSTEM
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United States of America Patent
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Issued Date -
Dec 31, 2015
app pub date -
Feb 20, 2014
filing date -
Feb 26, 2013
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Abstract
A zoom lens system includes a positive first lens group and a negative second lens group. The first lens group includes a cemented lens, a diffraction surface having a rotationally symmetric shape satisfying condition (1) formed on a cemented surface of the cemented lens, and condition (2) is satisfied:
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