MIDDLE TELEPHOTOGRAPHIC LENS

PROBLEM TO BE SOLVED: To excellently correct the various kinds of aberration while making a telephone ratio smaller than 1. SOLUTION: This lens is composed of a convergent front group G1 and a divergent rear group G2 in turn from an object side by interposing a diaphragm S. The group G1 is composed...

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Bibliographic Details
Main Author SUGA HIDEYUKI
Format Patent
LanguageEnglish
Published 28.01.2000
Edition7
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To excellently correct the various kinds of aberration while making a telephone ratio smaller than 1. SOLUTION: This lens is composed of a convergent front group G1 and a divergent rear group G2 in turn from an object side by interposing a diaphragm S. The group G1 is composed of one sheet of 1st positive lens L1 and the cemented lens of a 2nd positive lens L2 and a 3rd negative lens L3 in turn from the object side. The group G2 is composed of one sheet of 4th positive lens L4, the cemented lens of a 5th negative biconcave lens L5 and a 6th positive biconvex lens L6 and one sheet of 7th negative meniscus lens L7 whose concave surface is arranged on the object side in turn from the object side.
Bibliography:Application Number: JP19980194483