Ultra wide angle zoom lens

Details Ultra wide angle zoom lens Ultra wide angle zoom lens

1992-12-11

1994-01-04

Lerner, Martin

Optical: systems and elements

Lens

With variable magnification

359683, 359715, G02B 1514

Patent

active

052765539

ABSTRACT:
An ultra wide angle zoom lens is composed, in the order from the object side, of a first lens group of a negative refractive power, a second lens group of a positive refractive power, a third lens group of a negative refractive power, and a fourth lens group of a positive refractive power, in which the lens groups axially move, in the zooming operation from the wide angle end to the telephoto end, in such a manner that the distance between the first and second lens groups decreases, while that between the second and third lens groups increases and that between the third and fourth lens groups decreases, and in which the lens groups satisfy additional conditions.

REFERENCES:
patent: 4477153 (1984-10-01), Suda et al.
patent: 5000550 (1991-03-01), Takahashi et al.

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