I shot with the GH5 a couple weeks ago (review http://www.uwphotogr...5-camera-review) - and still image quality was superb. From the instagram pic it looks like there is an M43 flash trigger. Will be great if that's included - but I doubt it (for the video-centric reasons above).
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Excellent review! My concern is the size: the GH5 might be too chunky for me.
Excerpt from the review: "The Panasonic GH5 sits taller and is much thicker than the E-M1 Mark II and A7R II, especially when you take into account the larger eyecup around the electronic viewfinder. It also weighs the most, coming in at 1.6lbs, compared to the E-M1 Mark II’s 1.27lbs and the A7R II’s 1.38lbs. "
The Nauticam housing for the Sony a7rii is huge, imo, for a mirrorless. The GH5 Nauticam housing is probably even bigger. The image quality of micro four thirds can't touch that of the a7rii, imo, so doesn't a bigger camera and housing defeat the main purpose -- i.e smaller and lighter -- of using MFT cameras for underwater photography?