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There is no set rules on how to pick the lens and ports, but why would i prefer a dome port when i am shooting supermacro?
end of the day as long as you are happy with your choice, that is what it matters.
I remember when I started out taking pics, the desire to have lots of flexibility to take wide and macro underwater seemed very compelling. I'd try to take pictures of anything and everything... 60-80 pics a dive, only by chance would I get a decent pic. As I got more experienced, I spent more time thinking of the shots I want and setting up the camera specifically for that shot. I think I take 20-30 shots per dive now and i'm much happier w the results. Too much flexibility can be a bad thing. I pretty much just use 2 lenses now, 60mm macro and 8mm fisheye. I used to use the 9-18, but i've been really enjoying the fisheye, personal preference. For the 12-50, its an ok lens, but I couldnt bring myself to pay $800 for a port, not because it has quality glass, but because Oly decided on a funky interface. Its a neat engineering solution for a problem that shouldn't have existed. The 60mm macro is a great lens. The 60mn and 8mm fisheye are the 2 best reasons to use MFT over other mirrorless underwater IMO.