Pentax Imaging has developed the amphibious OptioWP digital camera with 5 megapixels and a 3x zoom, for use both on land and underwater. Every seam in the camera is protected with rubber sealant and an interlocking design to resist dust, pressure and moisture. The OptioWP can produce high-quality images up to three feet underwater without an additional underwater housing unit.

The camera features a 2-inch, low-reflection LCD, 10MB built-in memory, quick startup and...