Using Canon 180mm and Sigma 150mm in Manual focus with Nauticam

Hi,

Looking for advice on how to do manual focus with these lenses, as there is seemingly no gear available. I'm thinking to get either INON or Aquatica ports and use the focus control built into their ports. But wanted to check first... Are there any other options?

Thanks.

Nauticam make two extension rings now with focus dials built in, a 70mm and a 30mm. With a bit of Buxton magic, you may find these will be of use.