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References

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  1. E. M. Thorndike, J. Opt. Soc. Am. 40, 823 (1950).
    [Crossref]
  2. A. Ivanoff, Compt. rend. 232, 1193 (1951), Patent605290.

1951 (1)

A. Ivanoff, Compt. rend. 232, 1193 (1951), Patent605290.

1950 (1)

Ivanoff, A.

A. Ivanoff, Compt. rend. 232, 1193 (1951), Patent605290.

Thorndike, E. M.

Compt. rend. (1)

A. Ivanoff, Compt. rend. 232, 1193 (1951), Patent605290.

J. Opt. Soc. Am. (1)

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Figures (6)

Fig. 1
Fig. 1

When the camera lens is placed behind a plane window, the water-to-air surface thus formed diminishes the field α by a ratio approximately equal to 3 4.

Fig. 2
Fig. 2

Our method places before the camera lens an optical system (consisting of two lenses, the first of which is the window), and a virtual image of an immersed object is formed which is superposed on the object but located in the air.

Fig. 3
Fig. 3

By this method the field α is maintained.

Fig. 4
Fig. 4

Photograph taken in air.

Fig. 5
Fig. 5

Photograph taken in water through a plane window.

Fig. 6
Fig. 6

Photograph taken in water through our optical system.