Zoom lens system having a high zoom ratio

Details Zoom lens system having a high zoom ratio Zoom lens system having a high zoom ratio

1996-08-23

1998-01-06

Pham, Hoa Q.

Optical: systems and elements

Lens

With variable magnification

359775, G02B 1514

Patent

active

057061386

ABSTRACT:
A zoom lens system having a high zoom ratio and a high aperture ratio includes a first lens group having a positive power, a second lens group having a negative power, a third lens group having a negative power, and a fourth lens group having a positive power. The second lens group has a magnification varying function and is moved during a zooming operation. The third lens group has a focus compensating function and is moved during the zooming operation. The fourth lens group has an image forming function and is not moved during the zooming operation.

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