Optical: systems and elements – Lens – With variable magnification
Patent
1997-05-15
1998-03-31
Nelms, David C.
Optical: systems and elements
Lens
With variable magnification
359684, G02B 1514
Patent
active
057345082
ABSTRACT:
A compact, very-wide angle, high zoom-ratio zoom lens suitable for high-performance imaging use with a motion picture or still camera is disclosed. The zoom lens provides an image of an object over a continuous range of magnification from a wide-angle mode to a telephoto mode. The zoom lens comprises, coaxially objectwise to imagewise, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Each lens group is axially movable for zooming, and the second lens group is also axially movable for focusing. Each lens group preferably includes multiple lens elements, wherein each of the second and third lens groups preferably includes an aspheric lens element. The lens elements in the third lens group are disposed in a front and a rear lens group both having positive refracting power and both being independently axially movable for zooming. The lens exhibits a zooming ratio of at least 5-fold and a maximal field angle in the wide-angle mode of at least 80.degree.. An aperture stop is preferably disposed objectwise of the third lens group. The zoom lens preferably satisfies one or more specific performance conditions.
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Cornely John P.
Nelms David C.
Nikon Corporation
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