Standard zoom lens

Details Standard zoom lens Standard zoom lens

1994-08-01

1996-01-16

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359713, G02B 1514

Patent

active

054853141

ABSTRACT:
A compact standard zoom lens with a power ratio of the order of 2.7 and a wide-angle field angle of about 74.degree. comprises: a first lens group constructed of a negative meniscus lens with its concave surface having a large curvature toward an image and a positive meniscus lens with its convex surface toward the object, the first lens group having negative refracting power on the whole; and a second lens group constructed of a plurality of lenses and having positive refracting power on the whole. The first lens group incorporates an aspherical surface. A process of variable power is performed by mutually altering a space between the first and second lens groups. The first and second lens groups are constructed to satisfy particular conditions.

REFERENCES:
patent: 4195912 (1980-04-01), Doi et al.
patent: 4560253 (1985-12-01), Ogino
patent: 5005955 (1991-04-01), Ohshita
patent: 5339195 (1994-08-01), Ogata
patent: 5381268 (1995-01-01), Sato

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