Which wet wide angle lens for G7X MII?

A friend of mine asked my which WA adapter to acquire for his Canon Powershot G7X II. He has it in a D&D housing that has a M67 thread.

I am not familiar with the compact systems - could people with this camera please recommend which lens is optimal with respect to optical quality as well as to budget (I think Nauticam's WWL-1 too expensive for his plans)?

Eager to see suggestions...

Thanks, Wolfgang

I haven't got any experience with them, but the Fantasea/AOI UWL 09F doesn't look too bad at $450 less, although, obviously the Nauticam is better build quality, the specs seem matched for the most part.

Here's a review you can send his way:

https://www.bluewaterphotostore.com/uwl09-review-and-tests

They also released a "Pro" version now which has a Glass dome instead of the Acrylic on the standard version (but then it becomes more expensive than the Nauticam)

http://www.fantasea.com/s.nl/it.A/id.790/.f