Fixed-focus amphibious camera

Details Fixed-focus amphibious camera Fixed-focus amphibious camera

1987-02-17

1988-02-09

Perkey, W. B.

G03B 1708

Patent

active

047244488

ABSTRACT:
A fixed focus amphibian camera comprises a foremost element of a taking lens group on a water tight camera body. The foremost element has a concave shaped surface on its front side. When the camera is used in water the refractive power of the concave shaped surface is reduced due to the difference in the refractive index between water and air, so that the subject distance that can be focused is shortened in water than in air.

REFERENCES:
patent: 2001683 (1935-05-01), Jackman
patent: 2169874 (1939-08-01), Hardt
patent: 3320018 (1967-05-01), Pepke
patent: 3788730 (1974-01-01), Greenleaf
patent: 4100553 (1978-07-01), Danel
patent: 4295721 (1981-10-01), Rebikoff
Neblette et al, Photographic Lenses, 1973, p. 69.

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