Check your underwater camera housing to see how many feet it is rated (its maximum working depth underwater). Will the camera be adequately and safely protected during use in rugged environments? Does it have injection-molded plastic? Is it constructed to take the rigorous environments that underwater photographers and outdoor photographer’s experience, and will it protect digital cameras in these demanding activities?
Just as most underwater video manufacturers limit their design efforts to Sony cameras, the majority of still housing systems are built around the Nikon line. Although Canon has increased in popularity with topside professionals, few underwater housings are offered for Canon systems.
For your underwater camera housing, you will want something durable. It should be made from machined aluminum, black type III ‘hard’ anodize finish, and sealed with a nickel-acetate process, have no sticking buttons or faulty electronic controls, use quality optics with clarity, sharpness and no vignetting (cutoff dark corners) to spoil your images. It should allow you to change lenses underwater from wide to macro with a MultiPort and include lighting options.