The people that use genuine marine digital cameras are those where it is usually used in the course of their work as these cameras are very expensive Studying the life below the surface, a marine camera is only normally within the realm of marine biologists and other nautical scientists Waterproofing a camera is not an easy thing to do so many, so called, marine cameras aren’t really designed for that type of work
If your in the market for one of these marine digital cameras to buy you could buy one of the cheaper options if you are only going below the surface for a short while and not to deep.
There is lack of real weatherproof digital cameras owing to the problems of water ingress in to the camera and of water pressure Manufacturers have found it is easier just design a watertight case that goes around the digital camera instead. This type of casing will turn your conventional digital camera into an marine digital camera.
If you are shooting with your marine digital camera, you need to take note of a few things to help you come up with the best underwater images.
Water diffuses the light and the farther down you go the more this diffusion occurs. The result of this is a darkening of the captured image so adjustments to the white balance are needed. You will also notice when you see the pictures taken underwater that they appear larger than they should; this is part of the magnifying effect water has. You will have to pay more attention using the viewfinder to make sure you are achieving the shot you want.
It is not uncommon for waterproof case to spring a leak so before you go on your dive, check that the camera I still watertight by submerging it for a couple of seconds. It is quite easy for something as tiny as a human hair to break the camera case seal and this will lead to a leak. Small silica gel packs can be useful if they can fit in the case without causing an obstruction.
Ask your marine digital camera supplier if you can add extra lenses to complete the kit. If you enjoy looking at things close up then you will need to fit a macro lens.
The seals on the marine digital camera need to be kept clean and free fro contaminants so ensure the camera is thoroughly rinsed of when you return to the surface. In particular where sand is present then a stream of water to rinse it off is best.