Zoom lens system

Details Zoom lens system Zoom lens system

1984-03-28

1986-02-04

Corbin, John K.

G02B 964, G02B 1522

Patent

active

045681503

ABSTRACT:
A zoom lens system comprising a first, second, third and fourth lens groups, the first lens group being a focusing lens group and having positive refractive power, the second lens group being a variator and having negative refractive power, the third lens group being a compensator and having positive refractive power, the first, second and third lens groups constituting a varifocal subsystem, the fourth lens group being a relay lens, which comprises a first lens component comprising a positive lens and a negative lens and having positive refractive power as a whole, a second lens component comprising a positive lens, a third lens component comprising a negative lens, and a fourth lens component comprising a positive lens, the zoom lens system being small in size, light in weight and arranged that aberrations are corrected favourably.

REFERENCES:
patent: 4223981 (1980-09-01), Mizutani et al.
patent: 4468098 (1984-08-01), Itoh

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