Video Housings
Most modern underwater housing are pressure resistant to about one hundred feet, the practical safe depth of sport-diving. Typical construction is from moulded polycarbonate plastic, or aluminium for more professional systems. They usually have quick release snaps, an o-ring seal, and through housings fittings for several camera controls. A few are generic in nature from several manufacturers (such as Ikelite), and may be adaptable to several camera sizes. Most housings, however, are specific to the size and controls of a particular camera type and may be marketed by the camera manufacturer or an after-market company.
Occasionally housings might be advertised as "water housings" rather than underwater housings. Water housings are not intended for deepwater use, but rather are "splash housings for use around the pool, in rain, or to protect against falling overboard. At the most they are for very shallow activities - usually not more than about 1 or 2 metres / 3 to 6 feet in depth. One particular manufacturer offers a plastic bag type solution with a watertight seal, and a glass port front. The flexible bag allows some modest camera control, but suffers greatly when taken deeper since the bag compresses from the pressure and makes controls nearly impossible to operate. These are usually limited to snorkeling activities.
Read more about this topic: Underwater Videography
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