Zoom lens system of relatively high zoom ratio ranging to wide a

Details Zoom lens system of relatively high zoom ratio ranging to wide a Zoom lens system of relatively high zoom ratio ranging to wide a

1982-04-08

1985-01-22

Corbin, John K.

350423, G02B 704

Patent

active

044948280

ABSTRACT:
A zoom lens system of a relatively high zoom ratio ranging from a telephoto to a wide field angle is provided. The zoom lens system comprises from the object to the image side a first lens group of a positive refractive power, a second lens group of a negative refractive power consisting of a first negative subgroup, a second positive subgroup located on the image side of the first negative subgroup with an air space and a third negative subgroup located on the image side of the second positive subgroup with an air space, and a third lens group of a positive refractive power, wherein at least the air space between the first and second lens groups and the air space between the second and third lens groups are changeable upon zooming. The focusing can be practiced by moving the first lens group with the other lens groups left stationary.

REFERENCES:
patent: 4240697 (1980-12-01), Takano
patent: 4256381 (1981-03-01), Kreitzer
patent: 4299454 (1981-11-01), Betensky
patent: 4303312 (1981-12-01), Basista

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