Zoom lens system

Details Zoom lens system Zoom lens system

1982-02-16

1985-01-01

Corbin, John K.

G02B 1516

Patent

active

044913958

ABSTRACT:
A zoom lens system having, in order from the object side, a first lens group with a positive focal length, a second lens group with a negative focal length, a third lens component with a negative focal length and a fourth lens group with a positive focal length. The second lens group and third lens component are moved along the optical axis to achieve variation in the overall focal length and correction for focus movement. The first lens group includes one negative lens and at least two positive lenses, the second lens group includes, in order from the object side, a negative lens, a negative lens and a positive lens, the third lens component includes at least one negative lens, and the fourth lens group includes an optical path separation prism, and, in order from the object side, at least three positive lenses, at least two negative lenses and at least two positive lenses.

REFERENCES:
patent: 4050788 (1977-09-01), Wendisch

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