Zoom lens system with a movable distortion-correcting element

Details Zoom lens system with a movable distortion-correcting element Zoom lens system with a movable distortion-correcting element

1978-05-31

1981-01-20

Clark, Conrad J.

350189, G02B 1518

Patent

active

042458919

ABSTRACT:
A zoom lens system having a wide angle of view, a large diameter and a large zooming ratio in which the distortion is well corrected. The zoom lens system includes a movable lens group and a fixed lens group for zooming. A relay lens is provided behind the zooming lens group. A compensating lens having a small refractive power is inserted between the movable lens group and the fixed lens group and is moved in association with the zooming operation. The compensating lens consists of an aspherical lens of small refractive power or a group of spherical lenses having a small refractive power as a whole. The compensating lens is located at a position between the movable lens group and the fixed lens group where the light flux advancing along the optical axis of the zoom lens system converges to the image side.

REFERENCES:
patent: 3705759 (1972-12-01), Cook
patent: 4099845 (1978-07-01), Takesi
patent: 4145115 (1979-03-01), Betensky

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