Zoom lens with aberration variation prevented for focusing

Details Zoom lens with aberration variation prevented for focusing Zoom lens with aberration variation prevented for focusing

1976-12-01

1978-07-11

Sacher, Paul A.

350176, 350177, G02B 1514

Patent

active

040998452

ABSTRACT:
A focusing part in a wide-angle zoom lens. The focusing section of a wide angle zoom lens is composed, from the object end, of a diverging fixed lens group, a converging movable lens group and a converging fixed lens group. The movable lens group remains stationary during a zooming operation and moves along its optical axis toward an image when focusing from a distant object onto a nearer object. Aberrations remain unvaried even when focusing onto a nearby object. The converging fixed group furnishes a suitably positioned object point for a zooming section arranged behind the focusing section. The converging fixed lens group is composed of a plurality of lenses contributing to improvement in the image quality.

REFERENCES:
patent: 3598476 (1971-08-01), Merigold

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