Large aperture zoom lens system

Details Large aperture zoom lens system Large aperture zoom lens system

1985-02-28

1987-10-20

Corbin, John K.

G02B 964, G02B 1514

Patent

active

047010347

ABSTRACT:
A large-aperture zoom lens system comprising a first focusing lens unit having a positive focal length, a second variator lens unit having a negative focal length, a third compensator lens unit having a negative focal length and a fourth relay lens unit, said fourth lens unit consisting of a front subunit comprising at least one negative lens component and a rear subunit comprising at least two positive lens components. Said lens system comprises a small number of lens elements, and has a short total length, a long back focal distance and favorably corrected aberrations.

REFERENCES:
patent: 3659921 (1972-05-01), Hirose et al.
patent: 4525036 (1985-06-01), Fujibayashi et al.

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