The type of diving you will be doing must be taken into serious account before purchase. The Aquashot II fits both the old 24 frame and the new 27 frame rolls. EWA Marine manufacturers several models of flexible plastic bag-like housings that will fit just about any compact or SLR land camera. Acrylic and metallic housings for high-end SLRs are also available. While most are designed for a specific model camera, the Ikelite clear Lexan cases come in three designs which are designed to suit almost any SLR camera.
Most rigid housings come with a connection port for an accessory strobe.
Some have interchangeable domes to fit a wide variety of lenses. Another way to purchase an underwater camera and housing is as a package. By selling the camera and housing together, the manufacturers are able to reduce cost. For the average user, EWA Marine makes the Sealife 35, a focus-free automatic camera in a flexible housing. Plus, if the SeaLife 35 is accidentally dropped overboard from a moving dive boat, the air in the waterproof case will cause it to float, while the high visibility yellow camera case makes it easy to find.