Inverted-telephoto type wide angle lens system

Details Inverted-telephoto type wide angle lens system Inverted-telephoto type wide angle lens system

1987-08-28

1989-02-21

Arnold, Bruce Y.

350458, G02B 1515, G02B 1304

Patent

active

048060038

ABSTRACT:
An inverted-telephoto type wide angle lens system is provided which comprises from the object side to the image side: a first lens group of a negative refractive power; a second lens group of a positive refractive power; an aperture diaphragm; and a third lens group of a positive refractive power; wherein the second and third lens groups are shiftable to the object side along the optical axis of the lens system at different speeds from one another in a focusing operation to a closer object while the first lens group is stationary on the optical axis in the focusing operation.

REFERENCES:
patent: 3992085 (1976-11-01), Momiyama
patent: 4136931 (1979-01-01), Glatzel
patent: 4449793 (1984-05-01), Nakamura et al.

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