Nemrod, thank you for your note. We do have the Fix S90 housings and wide angle lenses in stock as well.
Fishsye Fix S90 Housing
Fishsye Fix S90 Housing
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...Question: I was about to buy the Ikelite housing to go with my S90 (that I'm currently waiting on), but I like the wet lense mount and what it can do. ...
I suggest that you get used to your new camera set-up before you add the additional lens.
Someone just showed me their ikelite S90 housing. It had 67mm threads for a wet lens. Likewise the Ikelite website says, "Ikelite W20 and other 67mm threaded lenses attach directly to port."