Zoom lens system

Details Zoom lens system Zoom lens system

1997-10-07

1999-11-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359677, G02B 1514

Patent

active

059781491

ABSTRACT:
A zoom lens system includes two lens components, and zooming is performed by moving a first lens component. The zooming is performed along a zoom curve such that the first lens component is moved out so that in-focus condition is obtained at a subject distance predetermined with respect to each focal length. As the subject distance, an excess focal length or a subject distance where the far side of the depth of field is the maximum flash reachable distance or a subject distance where the near side of the depth of field is the shortest object distance or a subject distance where the object distance or the magnification is fixed is set according to the purpose.

REFERENCES:
patent: 3051052 (1962-08-01), Bergstein
patent: 3294471 (1966-12-01), Back
patent: 3454321 (1969-07-01), Klein
patent: 4232942 (1980-11-01), Ikemori
patent: 4624536 (1986-11-01), Nakagawa
patent: 4842385 (1989-06-01), Tanaka

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