Apochromat type objective lenses

Details Apochromat type objective lenses Apochromat type objective lenses

1988-05-05

1989-08-08

Arnold, Bruce Y.

G02B 1302, G02B 936

Patent

active

048546860

ABSTRACT:
An apochromat type objective lenses, which is applied to an astronomical telescope; a telephoto lens for cameras or the like, comprising a semiapochromatic first lens system synthesized lens composed of two lenses in one group consisting of a convex lens and a concave lens, and an achromatic second lens system synthesized lens composed of two lenses in one group consisting of a concave lens and a convex lens, which is arranged in a spaced apart relation behind the semiapochromatic first lens system; the first and second lens systems being fulfilled with the condition below: ##EQU1## where, f, f: the focal length of the first and second lens systems,

REFERENCES:
patent: 2832263 (1958-04-01), Cook

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