Zoom lens

Optical: systems and elements – Lens – With variable magnification

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359684, G02B 1514

Patent

active

055284272

ABSTRACT:
A zoom lens having five groups. A first lens group has a positive refractive power; a second lens group has a negative refractive power; a third lens group has a positive refractive power; a fourth lens group has a negative refractive power; and a fifth lens group has a positive refractive power. The first through fifth lens groups are arranged in this order from the object side. A varifocal zooming operation is performed by changing a distance interval between respective lens groups and the second lens group is moved to perform a focusing operation.

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patent: 4844600 (1989-07-01), Tokumaru
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patent: 4871243 (1989-10-01), Ogawa et al.
patent: 4896950 (1990-01-01), Endo et al.
patent: 5042927 (1991-08-01), Ogawa et al.
patent: 5136430 (1992-08-01), Hamanishi

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