Nederlands
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.
Shop By
Isotta Extension Ring 26 mm with gear -B120 (AS788)€399.00 €329.75In stock26mm Extension ring with zoom knob
Learn More
Isotta Extension Ring 17 mm -B120 (AS804)€163.00 €134.71Backorder. Ready for shipment in 1 to 2 weeks17mm. 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.
Learn More
Isotta Extension Ring 20 mm -B120 (AS775)€169.00 €139.67In stock20mm. 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.
Learn More
Isotta Extension Ring 40 mm -B102 (AS750)€180.00 €148.76In stock40mm. 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.
Learn More
Isotta Extension Ring 60 mm -B102 (AS832)€204.00 €168.60Backorder. 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.
Learn More
Isotta Extension Ring 50 mm -B102 (AS808)€192.00 €158.68Backorder. Ready for shipment in 1 to 2 weeks50mm. 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.
Learn More
Isotta Extension Ring 40 mm -B102 with gear (AS823)€277.00 €228.93Backorder. Ready for shipment in 1 to 2 weeks40mm. Extension ring with 102 mm bayonet and ZOOM mechanism to increase the lenght of the housing's port by the mentioned measure and allow the use of different lenses.
Learn More
Isotta Extension Ring 30 mm -B102 (AS805)€168.00 €138.84In stock30mm. 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.
Learn More
Isotta Extension Ring 50 mm -B120 (AS778)€206.00 €170.25Backorder. Ready for shipment in 1 to 2 weeks50mm. 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.
Learn More
Isotta Extension Ring 25 mm -B120 (AS798)€175.00 €144.63Backorder. Ready for shipment in 1 to 2 weeks25mm. 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.
Learn More
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.