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Extension rings are used to fine-tune the distance between a port and an underwater housing to fit lenses of different sizes. To find the right extension rings for your lens, contact us at Bluewater Photo!

  • Nauticam N120 Extension Ring 60 II

    Nauticam N120 Extension Ring 60 II

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: NAU-22160

    Nauticam N120 Extension Ring 60 II   The Nauticam N120 Extension Ring 60 II is made from aluminum anodized alloy and has an effective length of 60mm with a N120 port setup. Please see Nauticam Port Chart   Any questions?  Feel free to...

    $497.00
  • Marelux Sea and Sea to Marelux Extension Ring 20

    Sea & Sea to Marelux Extension Ring 20

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-31702

    Sea & Sea to Marelux Extension Ring 20 Canon EF 11-24mm F4 Lens Not Supported Product Overview: The Sea & Sea to Marelux Extension Ring 20 extends your port system by 20mm and allows you to use your Sea & Sea ports with your Marelux...

    $200.00
  • Marelux Nauticam to Marelux Extension Ring 20

    Nauticam to Marelux Extension Ring 20

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-31701

    Nauticam to Marelux Extension Ring 20 Canon EF 11-24mm F4 Lens Not Supported Product Overview: The Nauticam to Marelux Extension Ring 20 extends your port system by 20mm and allows you to use your Nauticam ports with your Marelux housing.  ...

    $200.00
  • Marelux Extension Ring 40 with Focus Knob Sony FX3

    Marelux Extension Ring 40 with Focus Knob (Sony FX3)

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32202

    Marelux Extension Ring 40 with Focus Knob For Sony FX3  Product Overview: The Marelux Extension Ring 40 with Lock extends your port system by 40mm and it features a know to manually adjust the focus. Specifications: Depth Rating: 150m Port...

    $524.00
  • Marelux Extension Ring 40 with Focus Knob

    Marelux Extension Ring 40 with Focus Knob

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32101

    Marelux Extension Ring 40 with Focus Knob Product Overview: The Marelux Extension Ring 40 with Lock extends your port system by 40mm and it features a know to manually adjust the focus. Specifications: Depth Rating: 150m Port Mount: Series 5...

    $446.00
  • Marelux Extension Ring 100 with Lock

    Marelux Extension Ring 100 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32010

    Marelux Extension Ring 100 with Lock Product Overview: The Marelux Extension Ring 100 with Lock extends your port system by 100mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 ...

    $436.00
  • Marelux Extension Ring 90 with Lock

    Marelux Extension Ring 90 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32009

    Marelux Extension Ring 90 with Lock Product Overview: The Marelux Extension Ring 90 with Lock extends your port system by 90mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 Body...

    $396.00
  • Marelux Extension Ring 20 with Lock

    Marelux Extension Ring 20 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32002

    Marelux Extension Ring 20 with Lock Product Overview: The Marelux Extension Ring 20 with Lock extends your port system by 20mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 Weight...

    $226.00
  • Marelux Extension Ring 30 with Lock

    Marelux Extension Ring 30 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32003

    Marelux Extension Ring 30 with Lock Product Overview: The Marelux Extension Ring 30 with Lock extends your port system by 30mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 Weight...

    $246.00
  • Marelux Extension Ring 40 with Lock

    Marelux Extension Ring 40 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32004

    Marelux Extension Ring 40 with Lock Product Overview: The Marelux Extension Ring 40 with Lock extends your port system by 40mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 Weight...

    $266.00
  • Marelux Extension Ring 50 with Lock

    Marelux Extension Ring 50 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32005

    Marelux Extension Ring 50 with Lock Product Overview: The Marelux Extension Ring 50 with Lock extends your port system by 50mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 Weight...

    $286.00
  • Marelux Extension Ring 60 with Lock

    Marelux Extension Ring 60 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32006

    Marelux Extension Ring 60 with Lock   Product Overview: The Marelux Extension Ring 60 with Lock extends your port system by 60mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 ...

    $306.00
  • Marelux Extension Ring 70 with Lock

    Marelux Extension Ring 70 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32007

    Marelux Extension Ring 70 with Lock   Product Overview: The Marelux Extension Ring 70 with Lock extends your port system by 70mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 ...

    $336.00
  • Marelux Extension Ring 80 with Lock

    Marelux Extension Ring 80 with Lock

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: MX-32008

    Marelux Extension Ring 80 with Lock   Product Overview: The Marelux Extension Ring 80 with Lock extends your port system by 80mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 ...

    $366.00
  • Isotta 50mm Extension Ring B120

    Isotta 50mm Extension Ring B120

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: ISO-AS778-207

    Isotta 50mm Extension Ring B120 for Isotta Housings   The Isotta 50mm Extension Ring B120 has 102mm bayonet and is designed to be used with Isotta housings. It is built from black anodized material which is durable yet lightweight. It provides an...

    $205.00
  • Nauticam N85 to N120 34.7MM Port Adaptor

    Nauticam N85 to N120 34.7MM Port Adaptor

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: NAU-36064

    Nauticam N85 to N120 34.7MM Port Adaptor For Metabones EF-MFT Mount T Speed Booster Ultra 0.71x   Part #: Nau-36064 Product Overview: The adaptor is designed to convert N85 port opening to N120 with the used of Metabones EF-MFT Mount T Speed Booster...

    $544.00
  • Isotta Extension Ring with Zoom for Nikon Z7, Z6 Isotta Extension Ring with Zoom for Nikon Z7, Z6 Isotta Extension Ring with Zoom for Nikon Z7, Z6 Isotta Extension Ring with Zoom for Nikon Z7, Z6

    Isotta Extension Ring with Zoom for Nikon Z7, Z6

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: ISO-AS788-2343

    Isotta Extension Ring with Zoom for Nikon Z7, Z6 Housing   The Isotta Extension Ring with Zoom for Nikon Z7, Z6 has 120mm bayonet and is designed to be used with the Isotta Nikon Z7 Housing. It allows you to be able to utilize the zoom capability of...

    $386.40
  • Isotta 70mm Extension Ring B120

    Isotta 70mm Extension Ring B120

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: ISO-AS781-224

    Isotta 70mm Extension Ring B120 for Isotta Housings   The Isotta 70mm Extension Ring B120 has 102mm bayonet and is designed to be used with Isotta housings. It is built from black anodized material which is durable yet lightweight. It provides an...

    $229.00
  • Isotta 20mm Extension Ring B120

    Isotta 20mm Extension Ring B120

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: ISO-AS775-179

    Isotta 20mm Extension Ring B120 for Isotta Housings   The Isotta 20mm Extension Ring B120 has 102mm bayonet and is designed to be used with Isotta housings. It is built from black anodized material which is durable yet lightweight. It provides an...

    $169.00
  • Ikelite DL Port Extension 2in

    Ikelite DL Port Extension 2in

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: IKE-5516.69

    Ikelite DL Port Extension 2.0in Part #: Ike-5516.69 This Ikelite Port Extension extends the port by 2.0in and designed to be used with the new dry lock port system.   Please see Ikelite DryLock Port Chart We dive with our products all the time. Please...

    $219.95
  • Ikelite DL Port Extension 1.6in

    Ikelite DL Port Extension 1.6in

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: IKE-5516.67

    Ikelite DL Port Extension 1.6in Part #: Ike-5516.67 This Ikelite Port Extension extends the port by 1.6in and designed to be used with the new dry lock port system.   Please see Ikelite DryLock Port Chart We dive with our products all the time. Please...

    $199.95
  • Nauticam N120 Compact Port Extension 50

    Nauticam N120 Compact Port Extension 50

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: NAU-18550

    Nauticam N120 Compact Port Extension 50 Part #: Nau-18550 Product Overview: The Nauticam Compact Port Extension 50 is part of the Compact Port System and can be used to add 50mm effective length to a Compact Port setup when used with both a...

    $263.00
  • Nauticam N120 Compact Port Extension 40

    Nauticam N120 Compact Port Extension 40

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: NAU-18540

    Nauticam N120 Compact Port Extension 40 Part #: Nau-18540 Product Overview: The Nauticam Compact Port Extension 40 is part of the Compact Port System and can be used to add 40mm effective length to a Compact Port setup when used with both a...

    $244.00
  • Nauticam N120 Compact Port Extension 30

    Nauticam N120 Compact Port Extension 30

    Free Shipping on Orders Over $200 to the US and Canada

    SKU: NAU-18530

    Nauticam N120 Compact Port Extension 30 Part #: Nau-18530 Product Overview: The Nauticam Compact Port Extension 30 is part of the Compact Port System and can be used to add 30mm effective length to a Compact Port setup when used with both a...

    $206.00

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