Need some advice. I'm very new to this whole underwater photography thing and don't want to invest more that $400. I own a Canon A-85 digital camera that takes decent pics on dry land and want to know if I can purchase waterproof housing for it. Are underwater digital cameras that much different from land cameras (water resistance asside) Can I get decent results using a land camera in a housing as I would in an inexpensive UW digital? Are housings reliable? When you reply, please keep in mind I'm an amateur at this and just looking for average results. There may come a time in the future where I'd want to invest more but for now this is all I have work with. I'd appreciate any advice you can give.