Just a quick bit of trivia. The Olympus underwater housings and ports are actually made by a company called AOI and branded Olympus.
Apart from the material the housing is made from, there is little functional differences in the housings. I suppose one of the benefits of the Olympus housings is that they are more buoyant than an Aluminium from Nauticam or others - so you potentially don't need the float arms that I seem to have a lot of..
Reasons for going for a 'generic' brand housing from Nauticam, Aquatica, Sealux and others is that the port system is transferable between different camera brands, so one year I could be shooting Olympus, the next Panasonic - so you can invest in your ports (as they are not cheap) and know they will last for many years on future cameras.
Going with Olympus they made it difficult on some of their housings (previously) to change ports and then you are limited to a very small selection and also they have been known to change the port mount completely between cameras - so you really can only buy for your current camera, with the likelihood that you will need everything again for your next camera.
Also the Aluminium housings are rated for sub 60m - even 100m+ dives and have many additional advantages like vacuums and leak detectors, better ergonomics for gloves, handles etc.
As to sizing. The m43 cameras and housings are slowly creeping in size (compare my old EPL1 and the GH4 for example!) so I would suspect with the GH5 and EM1mk2 the housing won't be much smaller than a Sony or even a mid sized Canon.
Agreed the DPV should be a pretty good tripod on its own. But depends how you have it sent up. Buoyant or Negative (reminds me to add more nose weight to mine [emoji848]) so you will have to have it a negative.
AF for macro. A small aperture and a manual AF to get you in the ball park should give you focus and enough dof.
A little tabletop tripod I've used is the Manfrotto ones. They have a ball head on top and are pretty good. Just need to wash well after diving.
Re the GH4. The Continuous AF is pretty good if in HD but sadly poor in 4K.
I had it on, on a trip to Sri Lanka. Didn't think much about it as the rear screen looked okay. It was only when I got home and reviewed the footage, every now and again it would refocus and sort of spoil the shot. Plus you can hear in the audio the focus motor always going.
So now it's off, with the switch on MF, the back button set to 'AF-ON', which following the latest firmware works while recording now and shutter AF on. (That was another mistake, having that off... a bit narked and happily recording everything out of focus for a whole dive as I had forgot to set focus....!)
Dreifish. The corrections you made to the footage really make it better.
This is actually quite an interesting discussion. As it's all very subjective.
I had a play with the footage myself yesterday (also with CF Pro) and ended up with a slightly different variant. I tend to step away for a day and have another look as the longer you spend on a clip the worse it can become. Some stuff I've done is horrible, looking back!
Apart from the above you did with CF, I added another couple of CF layers and masked off the diver with shape and colour mask and made the black less saturated on the suit, while not blowing the tank highlights (while keeping everything under 100IRE) I also (tried to) neutralise the skin tones.
Perhaps we should have a show and tell of the same frame grab and see how everyone has a different view on correcting and can learn from others what they do. As looking at mine and yours. I prefer your blues!