Taking lens for underwater camera

Details Taking lens for underwater camera Taking lens for underwater camera

1994-03-25

1996-05-21

Nelms, David C.

Optical: systems and elements

Lens

Multiple component lenses

359772, 359780, 359684, 359686, G02B 934

Patent

active

055195407

ABSTRACT:
A taking lens for an underwater camera is constituted in the order from the side of a subject of a first lens group having no or slight refracting power, a second lens group having a positive refracting power, a third lens group having positive refracting power and a fourth lens group having negative refracting power. When focusing from the infinity to a closer distance, the first lens group is fixed to the image surface and the second and third lens groups are moved forward along the optical axis such that the distance between the second and third lens groups is changed.

REFERENCES:
patent: 4653876 (1987-03-01), Yamagata
patent: 4666261 (1987-05-01), Arai
patent: 4770516 (1988-09-01), Yamagata
patent: 4986643 (1991-01-01), Moriyama
patent: 5172273 (1992-12-01), Yamanashi
patent: 5402268 (1995-03-01), Tatsuno

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