Seems like AOI is branching out from Olympus/OM Systems into Sony now? As I understand it they used to partner with Fantasea, but I haven't seen any new releases from that company in a while now, so maybe it's no more?

 

https://www.aoi-uw.com/products/housings/aoi-uh-a7iv.html

 

Looks very interesting and relatively very affordable - Backscatter already has it listed for $1599, and that includes a vacuum system, and a TTL- and HSS-capable flash trigger, which would typically be quite pricey add-ons. A SeaFrogs A7 IV NG housing lists for $677, but add a ~$300 s-TURTLE, a ~$300 Leak Sentinel, and a ~$100 tray, and gets into the same ballpark. The built-in depth gauge is also a nice feature - not quite the same as mounting a full dive computer on the camera, but still quite handy, especially for blackwater dives. Controls layout looks well thought out. There doesn't seem to be an option for an add-on viewfinder, but there are inexpensive LCD magnifier hoods, including a 90-degree one for macro/muck diving. Cordless flash trigger connection (there is a unit that installs on camera hot shoe with contact pads that mate with contacts in the housing) should save on wear and tear on the famously complicated Sony multi-interface shoe connector, as you don't need to disconnect it every time you remove the camera from the housing. 

 

As far as downsides go, the photos and drawings don't show any bulkhead connections, so no option to run it with an external monitor other than maybe a housed phone over WiFi. Also, the only domes offered are 160mm and 220mm acrylics - no option for a fisheye minidome for CFWA; I wonder if Zen will make a DP-100 in AOI's new AX mount. I also don't see any zoom gears yet, but I'm sure those are coming.

It looks promising. We need more alternative underwater housing manufacturers especially in the more affordable sections