Stumbled upon this thread while Googling the new Laowa 10mm and thought I would pop in... I can't contribute to the tech talk, but it's all very helpful! I have ordered the lens and just waiting for it to arrive (back ordered here in Canada). I am shooting with a Sony A7Siii in an Aquatica Housing. I have the 8" acrylic dome and am currently using the Sony 16-35mm F4 lens. I am going to pair the Laowa with my 8" dome (shades removed) and my 25mm extension ring from my mini-macro port, so hopefully this works well!