Does anybody know whether Canon's Dual Pixel Autofocus works underwater?
This may be useful:
This was done with the 7DMKII, but I've used it on 70D, 5DMKIV, and 1DXMKII as well. In my experience, the Dual Pixel AF has been exceptionally accurate and worked very well compared to other large sensor camera's I've tried w/ continuous AF while filming. Hope that helps