| 摘要 |
A water-proof lens port to be attached to a water-proof camera case for a camera for underwater photography has a cylindrical water-proof main structure for enveloping the lens of the camera, a front window for allowing light from outside to reach the camera lens, an inner magnet ring containing magnets and affixed to the adjusting ring on the lens-barrel of the camera inside so as to rotate together, and an outer magnet ring containing magnets and supported rotatably around the cylindrical main structure. The inner magnet ring and the outer magnet ring are coupled to each other magnetically through a portion of the main structure in between by the force between these magnets contained in the inner and outer magnet rings such that the adjusting ring can be rotated by adjustingly rotating the outer magnet ring outside the main structure of the lens port. Such a lens port is attached to the front part of a camera case covering the main body of the camera. The back part of the camera case may be provided with a pick-up finder which couples with the finder of the camera inside the case.
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