Zoom lens with five lens groups

Details Zoom lens with five lens groups Zoom lens with five lens groups

1996-03-08

1997-09-16

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

056686684

ABSTRACT:
A zoom lens is composed of a first lens group of a negative refractive power, a second lens group of a positive refractive power and a third lens group of a positive refractive power, in which, in the zooming operation from the wide angle end to the telephoto end, the distance between the first and second lens groups decreases, the distance between the second and third lens groups varies, the distance between the third and fourth lens groups increases, and the distance between the fourth and fifth lens groups decreases.

REFERENCES:
patent: 4269484 (1981-05-01), Laurent
patent: 4634236 (1987-01-01), Masumoto
patent: 5276553 (1994-01-01), Tatsuno

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