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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.
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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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AOI Extension Ring 52mm OM-D port to OM-D housing€219.00 €180.99In stock52mm Extension ring ( OM-D to OM-D )
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AOI Extension Ring 34mm PEN port to PEN housingSpecial Price €185.00 €152.89 Regular Price €195.00In stock34mm Extension ring ( PEN to PEN )
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AOI ER-AX_AX-20 extension ring 20mm AX to AX Port Mount€179.00 €147.93Backorder. Ready for shipment in 1 to 2 weeksExtension Ring - 20mm AX to AX Port Mount. This extension is needed for selected lenses in selected underwater housings.
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AOI ER-AX_AX-30 extension ring 30mm AX to AX Port Mount€195.00 €161.16In stockExtension Ring - 30mm AX to AX Port Mount. This extension is needed for selected lenses in selected underwater housings.
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AOI ER-AX_AX-40 extension ring 40mm AX to AX Port Mount€212.00 €175.21In stockExtension Ring - 40mm AX to AX Port Mount. This extension is needed for selected lenses in selected underwater housings.
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AOI ER-AX_AX-60 extension ring 60mm AX to AX Port Mount€279.00 €230.58In stockAOI Extension Ring - 60mm AX to AX Port Mount. This extension is needed for selected lenses in selected underwater housings.
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AOI ER-AX_AX-70 extension ring 70mm AX to AX Port Mount€297.00 €245.45In stockExtension Ring - 70mm AX to AX Port Mount. This extension is needed for selected lenses in selected AOI underwater housings.
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AOI ER-AX_AX-80 extension ring 80mm AX to AX Port Mount€315.00 €260.33Backorder. Ready for shipment in 1 to 2 weeksExtension Ring - 80mm AX to AX Port Mount. This extension is needed for selected lenses in selected AOI underwater housings.
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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.