Wide angle zoom lens system

Details Wide angle zoom lens system Wide angle zoom lens system

1992-12-31

1994-12-06

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359691, 359692, 359784, G02B 1514

Patent

active

053716310

ABSTRACT:
The invention provides an ultra-wide zoom lens system that has a very wide angle coverage, as indicated by a field angle change of about 92.degree. to about 65.degree., is bright, as indicated by an F-number of 4.5 at the telephoto end, and is relatively simple in lens unit construction, and consists of, in order from the object side, a first lens unit I of negative refracting power, a second lens unit II of positive refracting power and a third lens unit III of negative refracting power, all said lens units being moved toward the object side for wide angle to telephoto zooming. The zoom lens system then conforms to Conditional Formulae (1), (2) and (3):

REFERENCES:
patent: 5000549 (1991-03-01), Yamazaki

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