I have been shooting the AOI for the OM-1 for quite a while (I was a real early adopter). For macro one of the 30,45,60 or 90 lenses (or all of them
). The AOI port for the 90 is awesome as it lets you change magnifications on the fly). I think a lot of modern thinking is that it is better to use a wet lens setup for wide angle than a traditional WA lens behind a dome. In the full frame world that is really happening. I have used the 12-50 for Mantas in Komodo with reasonable results using the AOI port for the 60 macro. A lot depends on what you want to shoot, for me mostly macro with an occasional wide shot.
Bill
One thing to remember about the AOI system, it is very negative underwater and needs quite a bit of flotation but probably not more than the Nauticam version.
Bill
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From a dive yesterday here in LA with the Oly 60, OM-1, AOI, 2x Backscatter MF-2 strobes