Great relative aperture telephoto zoom lens

Details Great relative aperture telephoto zoom lens Great relative aperture telephoto zoom lens

1993-02-01

1994-05-03

Look, Edward K.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

053092848

ABSTRACT:
A great relative aperture telephoto zoom lens of four-unit construction has, in succession from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. The fourth lens unit has, in succession from the object side, a front group having positive refractive power and a rear group having positive refractive power. The front group has, in succession from the object side, two positive lens components and a negative lens component. The rear group has, in succession from the object side, a positive lens component and a negative lens component, and is designed to satisfy predetermined conditions.

REFERENCES:
patent: 4105291 (1978-08-01), Tsuji
patent: 4451124 (1984-05-01), Basista
patent: 4693566 (1987-09-01), Imaizumi
patent: 5191476 (1993-03-01), Sato

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