Zoom lens system

Details Zoom lens system Zoom lens system

1995-03-03

1996-10-01

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

055615600

ABSTRACT:
A zoom lens system consists of a first lens group G1 which has a positive refracting power and is held stationary when zooming, second, third and fourth lens groups G2, G3 and G4 which are moved when zooming, a stop and a fifth lens group G5 for image-forming. The first to fourth lens groups G1 to G4, the stop and the fifth lens group G5 are arranged in this order from the object side. The second to fourth lens groups G2 to G4 are moved during zooming with the distance between the third and fourth lens groups G3 and G4 controlled so that the fluctuation in coma with change in the zooming position is well suppressed.

REFERENCES:
patent: 4245891 (1981-01-01), Doi et al.
patent: 4560254 (1985-09-01), Yoshikazu et al.
patent: 5050972 (1991-09-01), Mukaiya et al.

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