Nauticam N120 Extension Ring 40 II
Adds 40 mm of length to an N120 port setup
Extension rings sit between the housing and the port to set the correct distance for your lens, so it sits in the port's optical sweet spot. This one adds 40 mm of effective length within Nauticam's N120 port system. The updated "II" design supports ports and rings that use removable bayonet mounts. Always check the N120 port chart for the exact port and extension your lens needs.
Consider this if:
- your N120 port chart calls for a 40 mm extension with your lens and port
- you're building or reconfiguring an N120 port system
- you need the current "II" ring compatible with removable-bayonet ports
At a glance
| Port system | N120 |
| Effective length | 40 mm |
| Depth rating | 100 m |
| Body material | Anodised aluminium alloy |
| Mount | Removable bayonet compatible |
Get the port distance right
Underwater optics only perform when the lens sits at the correct distance behind the dome or flat port. The port chart specifies the exact extension for each lens — using the right ring is what delivers corner-to-corner sharpness and correct focus.
Resources
- Refer to the Nauticam N120 Port Chart for the correct port + extension combination for your lens.
