Optical: systems and elements – Lens – With variable magnification
Patent
1996-04-16
1997-11-11
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359684, 359689, 359690, G02B 1514
Patent
active
056870264
ABSTRACT:
A zoom lens is capable of close-range photography where the photographic magnification of the object can be instantly changed even with the camera and lens fixed to a tripod or like support. The zoom lens comprises in order from the object side: a first lens group of weak refractive power, a second lens group of negative refractive power, and a third lens group of positive refractive power. The first lens group comprises, in the following order from the object side: a positive lens group, a positive lens group and a negative lens group. The first lens group is fixed while the second lens group moves along a convex locus of a zooming loci with respect to the image plane and the third lens group moves from the image side toward the object side during zooming from the maximum wide-angle state to the maximum telephoto state. At least one out of the three lens groups in the first lens group moves along the optical axis during focussing from objects at infinity to at a close-range. The zoom lens also satisfies predetermined conditions.
REFERENCES:
patent: 4752121 (1988-06-01), Kitagishi
patent: 5272564 (1993-12-01), Suzuki et al.
patent: 5442486 (1995-08-01), Sato
patent: 5543969 (1996-08-01), Ito
Epps Georgia Y.
Lester Evelyn A.
Nikon Corporation
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