Cameras

Some of the most exspensive cameras will not be the best. You want to look at what depth you ate diving at, and how long then see if the camera you want will surve at that depth and that extent of time. It might also depend on if you are diving on nitrox or oxagen. You are also going to look at the quality of the picture that you are going to get. Like how many megapixels you will be geting. Compare to others and compare the others to others. 

Brand Names:

• GoPro Cameras http://gopro.com/products/( mostly has camera casings/housings)
• Sea & Sea http://www.seaandsea.com/ (mostly has camera casings/housings)
• Sealife http://www.sealife-cameras.com/
• Bonica http://www.bonicadive.com/servlet/StoreFront