Importance

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Abstract

This invention provides a high speed compact catadioptric, i.e. reflecting-refracting objective system of F/1.2. The lens system comprises, in accordance with the advance of the light rays, a positive lens with a convex surface toward the object, a lens with front and back surface concave toward the object and with a main mirror surfaced on the peripheral portion of said back surface. A counter-mirror is surfaced to the central portion of said positive lens and a field lens is cemented to the central portion of said lens with the main mirror surfaced thereon. Small zonal errors of spherical aberration, economical production and a reduced sensitivity to machining and mounting errors result from employing only two optical members which carry the mirrors and lens elements.

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First Claim