Thanks for the reply.
My Nauticam housing and the rest of the toys will arrive in a week, I hope.
Can't wait to mess with it.
I tested the GH4 with 12-35mm Panny on land. Using 4K, 3840 pixel, focus is slow but it hunts a bit even when subject in middle field.
Also being a camera type lens and not a camcorder or say an RX100, zooming on a subject with bright background will cause insane flicker on the bright areas....ha ha ha.
Since it is mirrorless, I wonder why the video focus is not as smart as my Sony NEX-7 and flicker free like NEX-7 when zooming.
Anyway, overall I am happy with new nice toys to play with....
Thanks n Dive Safe
Sony A6000 video autofocus is marvellous by the way check that one out