Importance

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Abstract

The oblique-viewing objective optical system includes a front-side lens group having a negative refractive power, an optical path converting element, an aperture stop, and a rear-side lens group having a positive refractive power. The front-side lens group includes a first lens and a second lens, and the rear-side lens group includes a third lens and a cemented lens which includes a positive biconvex lens and a meniscus-shape negative lens. The first lens is a negative lens having a concave surface directed toward an image-plane side, and the second lens is a single lens having a convex surface directed toward the image-plane side or a cemented lens, and the third lens is a positive lens. The following conditional expressions (1) to (3) are satisfied:

description='In-line Formulae' end='lead'1.6<D1/f<4.7  (1),description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'1.0<D2/f<3.3  (2), anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'9.0<L/f<31.0  (3).description='In-line Formulae' end='tail'

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First Claim