Zoom lens system

Details Zoom lens system Zoom lens system

1997-05-06

1999-09-21

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, 359686, G02B 1514

Patent

active

059561866

ABSTRACT:
A zoom lens system includes a positive lens unit and a negative lens unit. Focusing in a focal length range from a shortest focal length condition to a middle focal length condition is performed by moving the positive lens unit, and focusing in a focal length range from the middle focal length condition to a longest focal length condition is performed by moving the negative lens unit. The zoom lens system fulfills the following condition: ##EQU1## where B.sub.f is a distance from a rear end surface of the zoom lens system to a film at the shortest focal length condition and .increment.t is a diagonal length of the film.

REFERENCES:
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patent: 4936661 (1990-06-01), Betensky et al.
patent: 4991945 (1991-02-01), Estelle
patent: 5042926 (1991-08-01), Kikuchi
patent: 5054897 (1991-10-01), Ozawa
patent: 5329402 (1994-07-01), Sato
patent: 5418648 (1995-05-01), Ono

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