Zoom lens system

Details Zoom lens system Zoom lens system

1987-01-07

1989-07-04

Arnold, Bruce Y.

350426, 350428, G02B 1516, G02B 15177, G02B 1522

Patent

active

048446009

ABSTRACT:
A zoom lens system with a focusing system other than a front group focusing system is provided. The lens system comprises a first lens group including at least two sub-groups with a variable air space therebetween to be varied during zooming, and a focusing lens group located at the image side of the first lens group, the lateral magnification .beta..sub.F with respect to the focusing lens group being continuously variable during zooming with a condition,

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4196969 (1980-04-01), Itoh
patent: 4465343 (1984-08-01), Horimoto
patent: 4492437 (1985-01-01), Masumoto et al.
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4516839 (1985-05-01), Tokumaru
patent: 4634236 (1987-01-01), Masumoto
patent: 4636040 (1987-01-01), Tokumaru

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