Olympus OMD 10 mk II with Zuiko 60mm macro lense, Ikelite housing and strobe.
This was the first time I used an interchangeable lense system.
It does require a different mindset underwater. Snapshot cameras are more versatile. One can switch between macro and wide angle during the dive, but image quality is mediocre.
Not with this rig: don't even try to do wide angle or portraits of fishes larger than 30cm. And the depth of field is sooo small... but when everything works out, you get stunning images.