Zoom lens having high zoom ratio

Details Zoom lens having high zoom ratio Zoom lens having high zoom ratio

1996-10-21

1998-08-11

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359791, 359683, G02B 1514, G02B 912

Patent

active

057935351

ABSTRACT:
A zoom lens includes a positive first lens group, a positive second lens group, and a negative third lens group, in this order from the subject side. The first lens group consists of a negative first lens element, a positive second lens element and a positive third lens element in this order from the object side and satisfies the following relationships:

REFERENCES:
patent: 4773744 (1988-09-01), Yamanashi
patent: 4840467 (1989-06-01), Takada et al.
patent: 4978204 (1990-12-01), Ito
patent: 5272566 (1993-12-01), Aoki
patent: 5559636 (1996-09-01), Ito
patent: 5606460 (1997-02-01), Ohtake

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