Erect type zoom telescopic optical system

Details Erect type zoom telescopic optical system Erect type zoom telescopic optical system

1979-04-05

1981-02-10

Clark, Conrad J.

350410, 350423, 350446, G02B 1518, B02B 2500, G02B 2300

Patent

active

042497930

ABSTRACT:
This invention provides an erect type zoom telescopic optical system for a binocular or monocular telescope which consists of a positive lens group nearest to an object, a variator group, a compensator group, an image erect prism positioned between the variator and compensator groups, a field stop positioned at a predetermined definite position where the image of the object is formed by said compensator group movable along the optical axis interlocking with the variator group, and an eye-piece for observing the image of the object formed at the field stop. This invention provides a compact size system with high quality compensating aberrations.

REFERENCES:
patent: 1464655 (1923-08-01), Jacob
patent: 3286592 (1966-11-01), Wagner et al.
patent: 3360325 (1967-12-01), Gustafson
patent: 3619035 (1971-11-01), Hopkins
patent: 3947084 (1976-03-01), Noyes

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