It depends on how wide you go. With most standard lenses you can just use the standard port that comes with. When you start going really wide, say less than 20mm, you need to use some type of Dome port. Some systems require adapter rings in between the dome port and the housing- it all adds up very fast.
Dome port are essential for split level shots. I used to do them with my Inon lens, but since it was an adapter lens that screwed onto the outside of the housing you had to be very careful how you held the camera- or the water would slip out and mess up the focus. With a dome port/DSLR system there would only be air on the inside.
Here's some examples of shots I took in the past with my old system.
Jon
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Imagination is intelligence with an erection. - Victor Hugo
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