Zoom lens

Details Zoom lens Zoom lens

1987-03-16

1989-08-22

Bovernick, Rodney B.

350427, G02B 964, G02B 1514

Patent

active

048590428

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens group having a positive refractive power and fixed relative to an optical axis, a second lens group having a negative refractive power, a third lens group fixed relative to the optical axis and having a positive refractive power, and a fourth lens group having a positive refractive power, the second and fourth lens groups being axially moved to effect zooming, and the fourth lens group being also made to axially move to effect focusing.

REFERENCES:
patent: 3501224 (1970-03-01), Takahashi
patent: 4073573 (1978-02-01), Yamagishi
patent: 4256381 (1981-03-01), Kreitzer
patent: 4701034 (1987-10-01), Mihara

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