With this new Nauticam Wet Wide Lens you reach a perspective of 130 degrees with compatible 28mm lenses.
You can get closer to the object and have less suspend and more light. The quality is seriously unmatched!
The lens has M67 thread and can be screwed onto most housings. But it can also be mounted with the Bayonet Mounting Ring. The benefit of using the bayonet, that you can take it off and park it in a lens holder very fast. Or change to a different wetlens.