Zoom lens

Details Zoom lens Zoom lens

1997-08-26

1999-02-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514, G02B 1318

Patent

active

058673261

ABSTRACT:
A zoom lens comprises, in order from the image end to the object end, a negative power first lens group, a positive power second lens group, a positive power third lens group and a positive power fourth lens group. The first, second and third lens groups are axially movable in predetermined relation relative to one another and relative to the fourth lens group which is stationary to focus and vary the focal length of the zoom lens. The zoom lens satisfies at least the following condition:

REFERENCES:
patent: 5157550 (1992-10-01), Tsuchida et al.
patent: 5220458 (1993-06-01), Ohshita
patent: 5576889 (1996-11-01), Miyazaki

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