Zoom lens system

Details Zoom lens system Zoom lens system

1995-07-07

1998-07-28

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359685, G02B 1514

Patent

active

057869413

ABSTRACT:
A zoom lens system includes a plurality of lens units. First to third focal length zones are set according to the focal length. During focusing, in the first focal length zone, the lens units are moved at a first constant ratio, and in the third focal length zone, the lens units are moved at a second constant ratio which is different from the first constant ratio. In the second focal length zone, the movement ratio of the lens units varies according to the focal length.

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patent: 4196969 (1980-04-01), Itoh
patent: 4576444 (1986-03-01), Kawamura
patent: 4695133 (1987-09-01), Kitagishi et al.
patent: 4749265 (1988-06-01), Hattori et al.
patent: 4830477 (1989-05-01), Takahashi et al.
patent: 5202717 (1993-04-01), Ookubo et al.
patent: 5225941 (1993-07-01), Saito et al.

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