I've just spent two weeks diving in west Scotland with an A7II. Its a frustrating camera. It is capable of very good results indeed but it was a real fight to get it to operate as I wanted it to. And yes AF can be messy - it is happy to focus on suspended matter and persuading it not to was not always easy; over mud there was a lot of suspension. I can't compare it to an 810 but I still think that it and dSLRs are simply significantly different and have differing strengths and weaknesses. Battery life surprised me - 2 x hour plus dives in cool (13~14C) water without problem but I was not shooting video at all. I was interested in using the camera because its great strength for me is weight and I'm happy with it but I still have a housed dSLR too (with fisheye), so best of both worlds. I'm really torn over the A7 cameras - they are very capable, small and light and versatile, but frustrating in use both above and below water. I use it with Sony (above and below water) and Leica M lenses (above water).
- JamesR likes this