Zoom lens with an anamorphic converter

Details Zoom lens with an anamorphic converter Zoom lens with an anamorphic converter

1995-12-22

1997-09-16

Epps, Georgia Y.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359683, 359765, G02B 1502, G02B 1514, G02B 960

Patent

active

056686668

ABSTRACT:
The present invention provides an zoom lens with an anamorphic converter that is small, light weight, has high precision, and also high performance. The zoom lens includes, in order from the object side, a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive and negative refractive power, a fourth lens group with positive refractive power, and a fifth lens group with positive refractive power. The second lens group moves along the optical axis and first lens group is fixed along the optical axis when zooming from the maximum wide-angle state to the maximum telephoto state. An anamorphic converter lens group GA is provided freely attachable and detachable in the optical path in the gap between the fourth lens group and the fifth lens group in which the magnification in a specified plane including the optical axis and the magnification in a perpendicularly intersecting plane including the optical axis are mutually differ, in which the following condition is satisfied:

REFERENCES:
patent: 3751136 (1973-08-01), Kirhoff
patent: 4146305 (1979-03-01), Tanaka
patent: 4318592 (1982-03-01), Tanaka
patent: 4330180 (1982-05-01), Tanaka
patent: 5097360 (1992-03-01), Fukami

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