Reflecting/refractive optical system

Details Reflecting/refractive optical system Reflecting/refractive optical system

1988-04-05

1989-06-20

Corbin, John K.

350444, G02B 1708

Patent

active

048404721

ABSTRACT:
A long focal length, super-large aperture ratio reflecting/refractive optical system employing easily workable spherical surfaces and which is suitable for use in an astrocamera or a super-telephoto lens system. The lens system includes four optical units arranged along the optical path, including a first optical unit composed of a meniscus lens having a weak negative power, a second optical unit composed of a reflecting surface having a positive power, a third optical unit for deflecting light reflected from the second optical unit, and a fourth optical unit including at least one negative lens element.

REFERENCES:
patent: 2726574 (1955-12-01), Mandler
patent: 2982861 (1961-05-01), Menke
patent: 3160751 (1964-12-01), Dunning
patent: 4354742 (1982-10-01), Abel et al.
patent: 4411499 (1983-10-01), Abel et al.

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