Zoom lens

Details Zoom lens Zoom lens

1995-05-15

1996-11-19

Larson, James

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

055768903

ABSTRACT:
A zoom lens is disclosed comprising, from front to rear, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power and a fourth lens unit of positive refractive power, zooming from a wide-angle end to a telephoto end being performed by moving at least the first, second and fourth lens units in such a way that an air separation between the first and second lens units decreases, an air separation between the second and third lens units increases and an air separation between the third and fourth lens units decreases, wherein the form and the construction and arrangement of the members of the lens units and, if an aspheric surface is in use, its shape, are appropriately determined.

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patent: 5264965 (1993-11-01), Hirakawa
patent: 5276553 (1994-01-01), Tatsuno

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