Lens system having predetermined focusing power in different med

Details Lens system having predetermined focusing power in different med Lens system having predetermined focusing power in different med

1991-04-18

1992-09-15

Wintercorn, Richard A.

Optical: systems and elements

Prism

With reflecting surface

359665, G03B 1708

Patent

active

051481952

ABSTRACT:
A two element lens system provides a close up lens system which may be installed on a camera either above or under water, and allows the camera to be used in air and underwater without a means for lens position adjustment. The system uses two meniscus elements in a holder attachable to a receptacle on a camera body over an opening closed by a transparent window element. The lenses define therebetween a sealed compartment and a compartment which is located between one of the lenses and the window element having a vent which allows the water or air to flow into or out of that compartment. The curvatures of the lenses are selected so that the lens system has the same focusing power and focuses an image in an object space at the same image plane (the film plane with the aid of the camera's lens) when the vented compartment is filled with air or with water.

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Japanese publication, "Photographic Industries".

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