Zoom lens system

Details Zoom lens system Zoom lens system

1995-05-02

1997-07-01

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

056444346

ABSTRACT:
A zoom lens system consists of sequentially from the object side a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power. Zooming is performed by shifting the second lens unit and the third lens unit. The first lens unit keeps stationary during the zooming. Focusing is accomplished by shifting the second lens unit. The lengths of the first and the second lens unit along the optical axis are optimized so as to fulfill the conditions. The zoom lens system is suitable for particularly underwater cameras.

REFERENCES:
patent: 5035148 (1991-07-01), Ikemori et al.
patent: 5268792 (1993-12-01), Kreitzer et al.
patent: 5270857 (1993-12-01), Oizumi et al.

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