PHOTOGRAPHING LENS

PROBLEM TO BE SOLVED: To provide a compact and high-performance photographing lens whose various kinds of aberration are excellently corrected. SOLUTION: This photographing lens is constituted of a front group consisting of a negative meniscus lens whose convex surface is made to face an object side...

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Bibliographic Details
Main Authors SATO MASAE, MORI NOBUYOSHI
Format Patent
LanguageEnglish
Published 21.01.2000
Edition7
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide a compact and high-performance photographing lens whose various kinds of aberration are excellently corrected. SOLUTION: This photographing lens is constituted of a front group consisting of a negative meniscus lens whose convex surface is made to face an object side, a negative lens and a positive lens whose convex surface is made to face the object side and a rear group provided with a diaphragm and positive refractive power and constituted so that positive lenses at a side nearest to an object and at a side near to an image and at least one negative lens is included in turn from the object side. Then, when the focal distance of the rear group lens is defined as f2 and the focal distance of a whole system is defined as (f), the conditional expression of 0.45<f/f2<0.8 is satisfied.
Bibliography:Application Number: JP19980180652