Thanks everyone, that give me some idea.
Jonny, it's true that sometimes you need more than one encounter of the same creature to put together the footage, but I doubt he is that lucky to find two flamboyance cuttlefish eating the same type of shrimp.
It's good to know the the Olympus 12-50 lens is possible to get close to that kind of result. I think I'm going to invest in one of this since it's cheap and might come in handy:
I just bring myself to spend US$250 for a subsee adapter to just flip the lens in and out.......
I have 4 of these magnets. They work as advertised. I have loaded a subsee and 1-2 more Fun-in +5 diopters stacked with no issue. Any more and it might drop off on land. There's always a danger of a force coming from the side dislodging the lens but if it is just one lens then the risk is quite minimal.
One caveat. the magnets also gets a bit of sand stuck on it underwater. The type of black sand with iron content. So you'll need to clean it off from time to time.
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