The heavy duty thick wall dSLR housing is molded of corrosion free clear polycarbonate, features full capabilities, and operates safely to 60m (200 feet). The housing "O" ring seal is a masterpiece in fail-safe simplicity compared to designs that require stuffing the "O" ring into a groove. You can see that the "O" ring is sealed. The housing size and weight provides neutral buoyancy and superb handling underwater. Camera installation is quick and simple. The dependable controls are conveniently placed at your fingertips, and kept water tight with Ikelite pioneered Quad-Ring-« seal glands proven to be the most reliable method for sealing controls. Functionality Controls for all camera functions are provided with the exception of the diopter adjustment control. AE/AF lock can be activated with your thumb while holding the housing's handle. An oversized zoom knob can be comfortably reached with the fingertips of your left hand. All camera modes including D-Movie and Live View can be accessed through the h