ZOOM LENS AND OPTICAL APPARATUS HAVING IT

PROBLEM TO BE SOLVED: To provide a bright zoom lens having a small F number over an entire region from a wide angle end state to a distant end state, and to provide an optical apparatus having it. SOLUTION: The zoom lens has a first negative refractive power lens group G1, a second positive refracti...

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Bibliographic Details
Main Author ONO HIROKI
Format Patent
LanguageEnglish
Published 29.05.2008
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide a bright zoom lens having a small F number over an entire region from a wide angle end state to a distant end state, and to provide an optical apparatus having it. SOLUTION: The zoom lens has a first negative refractive power lens group G1, a second positive refractive power lens group G2, and a third positive refractive power lens group G3 in order from an object side. When being magnified from the wide angle end state to the distant end state, the first lens group and the second lens group are moved along an optical axis. The first lens group has a positive lens, and the positive lens of the first lens group includes a medium of 1.90 or more of a refractive index to the d line. COPYRIGHT: (C)2008,JPO&INPIT
Bibliography:Application Number: JP20060304884