When people say "wide angle" they often have different expectations. For actual wide angle advice on SB, Nem and Adrian are the two guys here that I know are shooting true WA.
FWIW, when I go to
Sea & Sea for the specs on the DX 1200 HD, they say the focal length of the camera is an actual 7.3 mm to 21.9 mm which they say converts to a 35 mm equivalent of 35 mm to 102 mm, and
their WA lens translates to 19 mm (35 mm equiv.) but that's only 79
o (and 95
o on land) which isn't
really WA at all. Not like the underwater WA shots you may have seen online or in coffee table books, etc.
Not trying to nitpick, because 79
o may be fine for what you had in mind, but its not terribly wide by underwater standards (but the manufacturers won't tell you that). At least with the 590is and Ikelite housing, you could buy the
Inon WA lens that would allow you to add the
true WA dome for something like 131.6
o underwater. Sea & Sea's WA lens, like most others, is a one-trick pony that you can't add a dome lens to.
If true WA is the goal, you'd be better served to look at the Inon combination (above) or maybe their
Fisheye WA lens for the Inon AD bayonet mount, and then "back into" a housing and camera that would fit the lenses. The lenses are going to be the lion's share of the cost anyway, so it actually makes sense to start that direction from a compatibility perspective. Everything else tends to box you into a system that may not be as expandable as you might like it to be later.
HTH
