Zoom lens system

Details Zoom lens system Zoom lens system

1983-01-31

1985-03-12

Corbin, John K.

350423, G02B 1518

Patent

active

045041245

ABSTRACT:
A zoom lens system comprising a first lens group having positive power and having the focusing function, a second lens group having negative power and having the magnification-varying function, a third lens group having positive power and having the magnification-varying function, and a fourth lens group having positive power and having the magnification-varying function, the zoom lens system being arranged to have a large zoom ratio, i.e., the range of field angle from 24.degree. to 62.degree., and numerical aperture of F/4 and being arranged compactly.

REFERENCES:
patent: 4240700 (1980-12-01), Ogawa et al.

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