Underwater wide angle lens

Details Underwater wide angle lens Underwater wide angle lens

1994-09-12

1996-11-26

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359762, G02B 1514

Patent

active

055791697

ABSTRACT:
An underwater wide angle lens is provided, in succession from the object side, with a fore group comprising a first lens group having negative refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power, and a rear group comprising a fifth lens group having positive refractive power and a sixth lens group having positive refractive power. Preferably, the fifth lens group and/or the sixth lens group is a cemented lens and focusing is effected by one or more of the second to sixth lens groups. Preferably each of the first lens group, the second lens group and the third lens group is a meniscus lens having its convex surface facing the object side.

REFERENCES:
patent: 3737214 (1973-06-01), Shimizu
patent: 4099845 (1978-07-01), Takesi et al.
patent: 4540249 (1985-09-01), Mogami
patent: 5325236 (1994-06-01), Tanaka

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