Photo-taking lens for an underwater camera

Details Photo-taking lens for an underwater camera Photo-taking lens for an underwater camera

1988-07-19

1989-08-15

Arnold, Bruce Y.

350462, G02B 1304

Patent

active

048568805

ABSTRACT:
A photo-taking lens of a two-unit, five element construction for an underwater camera comprises, in succession from the object side, a fixed forward unit having a first element having a meniscus lens having its convex surface facing the object side and having a negative refractive power when the medium on the object side is water, and a rearward unit having a positive second element having a biconvex positive lens, a negative third element having a biconcave negative lens, a positive fourth element having a positive meniscus lens having its convex surface facing the image side, and a positive fifth element having a positive lens having its surface of sharper curvature facing the image side, and movable as a whole along the optic axis for focussing. The photo-taking lens satisfies the following condition:

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