Zoom lens

Details Zoom lens Zoom lens

1989-06-19

1990-08-14

Arnold, Bruce Y.

350427, G02B 1514, G02B 964

Patent

active

049482394

ABSTRACT:
Zoom lenses having sequentially from the front a positive unit facing the long conjugate and consisting of a cemented doublet followed by a single element; a negative unit movable for zooming and consisting of a negative element and a negative doublet concave toward each other; a second negative unit movable for zooming and consisting of a single component including at least one negative element; and a stationary rear unit comprising a petzval-type lens group. The zoom lens has a zoom range greater than 5.times., a total coverage exceeding 48.degree. at some zoom position and an f-number is f-1.48.

REFERENCES:
patent: 4281906 (1981-08-01), Tanaka
patent: 4390248 (1983-06-01), Ikemori
patent: 4518228 (1985-05-01), Sugiura
patent: 4572620 (1986-02-01), Kikuchi
patent: 4749267 (1988-06-01), Mihara
patent: 4770510 (1988-09-01), Mukaiya
patent: 4812024 (1989-03-01), Makaiya

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