Finally catching up on Underwater Photography Show episodes and got to the one about curved ports for wider macro shots.

In the comments, @Alex_Mustard mentions using the Sony 50mm with the Nauticam 4" port and a custom 16mm port extension.

Unfortunately the one he mentions has been discontinued. There is a N85 version available which should still work with the 50mm macro, but Nauticam's N100 to N85 adapter (which would have been perfect as its 20mm) has also been discontinued.

Are there any other options other than going fully custom?

5 hours ago, shokwaav said:

Finally catching up on Underwater Photography Show episodes and got to the one about curved ports for wider macro shots.

In the comments, @Alex_Mustard mentions using the Sony 50mm with the Nauticam 4" port and a custom 16mm port extension.

Unfortunately the one he mentions has been discontinued. There is a N85 version available which should still work with the 50mm macro, but Nauticam's N100 to N85 adapter (which would have been perfect as its 20mm) has also been discontinued.

Are there any other options other than going fully custom?

I believe you can still get the port but they are special order.

Have a look on UWVisions (Nauticam UK distributor) run by Dr Alex Tattershall and he maybe able to help.

I am looking at doing the exact same thing 👍