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Choosing the right port system for your underwater housing is essential for achieving sharp, distortion-free images underwater. Whether you shoot wide-angle or macro, your port setup directly affects image quality, field of view, and usability.
![Nauticam extension ring 50 with lock [21150]](https://www.uwcamerastore.com/media/catalog/product/cache/585a9f53153ae04cde57614e2eac8117/n/a/nauticam-extension-ring-50-with-lock-21150.jpg)
Nauticam extension ring 50 with lock [21150]€340.00 €280.99Backorder. Ready for shipment in 1 to 2 weeksThe Nauticam Extension Ring 50 with Lock is part of the N120 Port System and can be used to add 50mm effective length to an N120 Port setup.
Learn More![Nauticam extension ring 70 with lock [21170]](https://www.uwcamerastore.com/media/catalog/product/cache/585a9f53153ae04cde57614e2eac8117/n/a/nauticam-extension-ring-70-with-lock-21170.jpg)
Nauticam extension ring 70 with lock [21170]€350.00 €289.26Backorder. Ready for shipment in 1 to 2 weeksThe Nauticam Extension Ring 70 with Lock is part of the N120 Port System and can be used to add 70mm effective length to an N120 Port setup.
Learn More![Nauticam extension ring 60 with lock [21160]](https://www.uwcamerastore.com/media/catalog/product/cache/585a9f53153ae04cde57614e2eac8117/n/a/nauticam-extension-ring-60-with-lock-21160.jpg)
Nauticam extension ring 60 with lock [21160]€350.00 €289.26Backorder. Ready for shipment in 1 to 2 weeksThe Nauticam Extension Ring 60 with Lock is part of the N120 Port System and can be used to add 60mm effective length to an N120 Port setup.
Learn More![Nauticam extension ring 30 w lock [21130]](https://www.uwcamerastore.com/media/catalog/product/cache/585a9f53153ae04cde57614e2eac8117/e/x/extension-ring-30-with-lock.jpg)
Nauticam extension ring 30 w lock [21130]€320.00 €264.46Backorder. Ready for shipment in 1 to 2 weeksThe Nauticam Extension Ring 30 with Lock is part of the N120 Port System and can be used to add 30mm effective length to an N120 Port setup.
Learn More![Nauticam extension ring 20 with lock [21120]](https://www.uwcamerastore.com/media/catalog/product/cache/585a9f53153ae04cde57614e2eac8117/n/a/nauticam-extension-ring-20-with-lock-21120.jpg)
Nauticam extension ring 20 with lock [21120]€310.00 €256.20Backorder. Ready for shipment in 1 to 2 weeksThe Nauticam Extension Ring 20 with Lock is part of the N120 Port System and can be used to add 20mm effective length to an N120 Port setup.
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Onderwaterhuis.NL extension ring 25mm for Olympus PEN€109.00 €90.08In stockOnderwaterhuis.NL 25mm extension ring for Olympus PEN. Extension ring for use of the Olympus M.ZUIKO DIGITAL ED 60mm 1: 2.8 macro lens in a Olympus PT-EP05L or PT EP06L underwater housing. Learn More![Nauticam N120 extension ring 50 II [22150]](https://www.uwcamerastore.com/media/catalog/product/cache/585a9f53153ae04cde57614e2eac8117/n/a/na22150.jpg)
Nauticam N120 extension ring 50 II [22150]€600.00 €495.87In stockNauticam N120 extension ring 50 II [22150]
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AOI Extension Ring 22mm OMD port to OMD housing€209.00 €172.73Backorder. Ready for shipment in 1 to 2 weeksAOI Extension Ring 22mm OMD port to OMD housing Learn More
AOI Extension Ring 24mm PEN port to PEN housingSpecial Price €185.00 €152.89 Regular Price €195.00In stockAOI Extension Ring 24mm PEN port to PEN and Om-D Pt-EP13 housing
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Isotta Extension Ring 60 mm -B120 (AS780)€218.00 €180.17Backorder. Ready for shipment in 1 to 2 weeks60mm. Extension ring with 102 mm bayonet to increase the lenght of the housing's port by the mentioned measure and allow the use of different lenses.
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Extension rings for underwater housings and port systems
Extension rings are essential components in modular underwater housing systems for mirrorless and DSLR cameras. They are placed between the housing and the port to achieve the correct distance between the lens and the port glass.
Why extension rings are important
The correct positioning of your lens inside the port is crucial for image quality. Using the wrong extension ring can result in soft corners, distortion or reduced sharpness. Each lens requires a specific setup depending on focal length and port type.
- Ensures correct lens-to-port distance
- Improves sharpness and reduces distortion
- Required for both macro and wide-angle setups
Compatibility and port charts
Extension rings are available from leading brands such as Nauticam, Ikelite and other manufacturers, and are always specific to a certain port system. To ensure compatibility, you can use port charts to find the correct combination of extension rings, ports and gears for your setup.
Different sizes and systems
Extension rings are available in various lengths and connection types, depending on the manufacturer. Choosing the right extension ring ensures your underwater setup performs as intended.
Frequently asked questions about extension rings
What is an extension ring for an underwater housing?
An extension ring is used to position your lens correctly inside the port. It sits between the underwater housing and the port.
Do I always need an extension ring for an underwater housing?
No, not always. Whether you need an extension ring depends on your lens and port combination. This can be checked in the port charts.
How do I know which extension ring I need for my underwater housing?
You can use port charts to find the correct extension ring for your specific lens and underwater housing.
Are extension rings brand specific?
Yes, extension rings are designed for specific brands and port systems. Always make sure the extension ring matches your housing and port system.
Can I use the wrong extension ring on my underwater housing?
Using the wrong extension ring can lead to poor image quality, such as softness or distortion. Always follow the recommended setup.
Related articles about extension rings for underwater housings
- Posted: March 17, 2026Categories: Underwater HousingsRead more »
- Posted: August 26, 2024Categories: Underwater Housings
Read more »AOI underwater housings are compact, lightweight, and ergonomic. Depending on the lens you want to use with your camera, you'll need a matching AOI port, gear and AOI extension ring. AOI has created port charts where you can look up exactly which items you need to start underwater photography with your lens in the underwater housing.
- Posted: March 06, 2024Categories: Underwater Housings
Read more »Many Nauticam housings provide interchangeable ports, enabling the use of various lenses. However, different lenses may demand distinct ports and extension rings to maintain or correct for underwater optics. Certain lenses permit access to zoom and manual focus functions while inside the housing,
- Posted: March 05, 2024Categories: Underwater Housings
Read more »Ikelite has evaluated most popular lenses, provided they are well suited for use underwater. Their recommendations for lens ports can be found in the lens port charts. First, you need to know which mount your underwater housing has.