Olympus Optical Company, Ltd.

Shin'ichi Mihara

A cata-dioptric type telephoto lens system comprising a first, second, third, fourth and fifth lenses, wherein the first lens is a positive meniscus lens arranged convex toward the object side, the second lens is a negative meniscus lens arranged convex toward the image side and having a reflecting surface formed on its convex surface by leaving a transparent central portion, the third lens is a biconvex lens cemented to the surface on the image side of the first lens, the fourth lens is a biconcave lens cemented to the surface on the object side of the first lens and having a reflecting surface formed on its surface on the object side, and the fifth lens is a negative meniscus lens cemented to the surface on the object side of the second lens, the cata-dioptric type telephoto lens system being extremely light in weight and compact and having aberrations corrected favorably.

Cata-dioptric type telephoto lens system

An attachment lens system having favorably corrected various aberrations, especially curvature of field, comprising a front lens group and a rear lens group: said first lens group consisting of a negative meniscus lens component, a second biconvex lens component and a third biconcave lens component, and said rear lens group consisting of a fourth biconvex lens component, a fifth positive meniscus lens component and a sixth biconcave lens component.

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Hachioji, Japan

Shin'ichi Mihara