Zoom lens and optical apparatus using the same

Details Zoom lens and optical apparatus using the same Zoom lens and optical apparatus using the same

1999-03-05

2000-12-26

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359769, 359686, G02B 1514

Patent

active

061668648

ABSTRACT:
A zoom lens includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, zooming from a wide-angle end to a telephoto end being effected by moving the second lens unit toward the image side, and shifting of an image plane due to zooming being compensated for by moving the fourth lens unit, wherein the second lens unit consists of four separate single lenses including three negative lenses and one positive lens, and the third lens unit has at least one positive lens both surfaces of which are aspherical.

REFERENCES:
patent: 5719708 (1998-02-01), Nagaoka
patent: 5963378 (1999-10-01), Tochigi et al.

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