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Extension Rings

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!

48 of 140 Items
  • Ikelite DL Port Extension 42mm

    Ikelite DL Port Extension 42mm

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

    SKU: IKE-75042

    Ikelite DL Port Extension 42mm Part #: Ike-75042 This Ikelite Port Extension extends the port by 42mm 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 call...

    $250.00
  •  Ikelite Canon 8-15 mm f/4L EF USM Fisheye Dome Port Kit Option 2  Ikelite Canon 8-15 mm f/4L EF USM Fisheye Dome Port Kit Option 2  Ikelite Canon 8-15 mm f/4L EF USM Fisheye Dome Port Kit Option 2

    Ikelite Canon 8-15 mm f/4L EF USM Fisheye Dome Port Kit Option 2

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

    SKU: IKE-CANON815DOMEKIT2

    Ikelite Canon 8-15 mm f/4L EF USM Fisheye Dome Port Kit - Option 2   Compact and lightweight for travel. Dome shade must be removed. Some vignetting (shadows in the corners of the image) will be present. Zoom gear may alternatively be used to...

    $650.00
  •  Inon S-MRS Magnet Ring RF14-35

    Inon S-MRS Magnet Ring RF14-35

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

    SKU: INO-4570018120664

    Inon S-MRS Magnet Ring RF14-35   A magnet ring specifically designed for "Canon RF14-35mm F4L IS USM". In combination with compatible "MRS EXT. Ring 50", it supports zoom operation of the "RF14-35mm F4L IS USM". Not compatible with other MRS port...

    $220.00
  •  Inon S-MRS Magnet Ring C8-15 Set  Inon S-MRS Magnet Ring C8-15 Set

    Inon S-MRS Magnet Ring C8-15 Set

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

    SKU: INO-4570018120510

    Inon S-MRS Magnet Ring C8-15 Set   A set of "S-MRS Magnet Ring" and "Magnet Ring Adapter C8-15". Attaching on the Canon "EF8-15mm F4L Fisheye USM" lens enables zoom operation. Only "MRS EXT. Ring 33" and "MRS EXT. Ring 111" are usable. Other MRS...

    $99.00
  •  Inon Extension Ring 36

    Inon Extension Ring 36

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

    SKU: INO-4562121435896

    Inon Extension Ring 36   An extension ring with 36mm effective length using M96 male/female threaded mounts. Required when using Canon "EF100mm f/2.8L Macro IS USM" + "Mount Adapter EF-EOS R" or "Sigma 70mm f/2.8 DG MACRO" + "Mount Adapter EF-EOS...

    $154.00
  •  Inon MRS Extension Ring 111  Inon MRS Extension Ring 111  Inon MRS Extension Ring 111

    Inon MRS Extension Ring 111

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

    SKU: INO-4570018120435

    Inon MRS Extension Ring 111   MRS EXT. Ring exclusively for "RF100mm f/2.8 L MACRO IS USM". Use with "M86 Port 07" attached on the front end. The new S-MRS provides smoother operation with less play or rattle comparing to the previous...

    $350.00
  •  Inon MRS Extension Ring 54

    Inon MRS Extension Ring 54

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

    SKU: INO-4570018120633

    Inon MRS Extension Ring 54   An Extension Ring for Canon "RF15-30mm F4.5-6.3 IS STM" employing the S-MRS system, where zooming operation is controlled by the magnetic attraction. Attaching "S-MRS Zoom Ring RF15-30" on the camera lens enables zooming...

    $275.00
  •  Inon MRS Extension Ring 50

    Inon MRS Extension Ring 50

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

    SKU: INO-4570018120626

    Inon MRS Extension Ring 50   An extension ring tailored for Canon RF14-35mm F4L IS USM to provide smoother operation with less play or rattle in combination with the S-MRS Magnet Ring RF14-35 on the lens. Housing side is same M96 threads on the...

    $638.00
  •  Inon S-MRS Magnet Ring

    Inon S-MRS Magnet Ring

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

    SKU: INO-4570018120503

    Inon S-MRS Magnet Ring   A magnet ring attached on the camera lens to control various lens rings by magnetic attraction with an S-MRS Control Ring on "MRS EXT. Ring 33" or "MRS EXT. Ring 111".The S-MRS Magnet Ring has been newly designed to optimize...

    $28.00
  •  Inon MRS Extension Ring 33  Inon MRS Extension Ring 33

    Inon MRS Extension Ring 33

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

    SKU: INO-4570018120428

    Inon MRS Extension Ring 33   The new S-MRS provides smoother operation with less play or rattle comparing to the previous model. By combining the EOS R6 Mark II with an RF lens, the MF Peaking function can also be used during full-time manual...

    $220.00
  • Marelux Extension Ring 35 for MX-RX100M7 Housing

    Marelux Extension Ring 35 for MX-RX100M7 Housing

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

    SKU: MX-32401

    Marelux Extension Ring 35    The Marelux Extension Ring 35 for MX-RX100M7 Housing.       We offer lifetime support with all purchases.Please call or email us with any questions, our knowledgable staff would love to assist you...

    $120.00
  • Marelux Extension Ring 15 with Lock

    Marelux Extension Ring 15 with Lock

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

    SKU: MX-32001

    Marelux Extension Ring 15 with Lock   Product Overview: The Marelux Extension Ring 15 with Lock extends your port system by 15mm and it features a safety lock to avoid accidents Specifications: Depth Rating: 150m Port Mount: Series 5 Body Material:...

    $236.00
  • 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...

    $536.00
  • 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...

    $406.00
  • 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...

    $246.00
  • 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...

    $266.00
  • 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...

    $286.00
  • 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...

    $306.00
  • 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 ...

    $326.00
  • 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 ...

    $346.00
  • 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 ...

    $376.00
  •  Inon Extension Ring 81

    Inon Extension Ring 81

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

    SKU: INO-4562121435919

    Inon Extension Ring 81   An extension ring is compatible with "Canon EXTENDER EF2x". Required when using Canon "EF100mm f/2.8L Macro IS USM", Kenko x 2.0 Teleconversion Lens, and LEICA DG MACRO-ELMARIT 45mm/F2.8 ASPH./MEGA O.I.S. in combination with...

    $165.00
  • AquaTech Aquatec X-40 Adapter

    Aquatec X-40 Adapter

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

    SKU: AQT-10825

    AquaTech X-40 Adapter Part #: AQT-10825   Product Description: The AQUATECH X-40 Adapter ring is designed for a wide range of lenses to allow for the use flat and dome ports. The X-40 Adapter is compatible with the X Series and P Series Lens port...

    $149.00
  •  Isotta Adapter for Nauticam Ports V2

    Isotta Adapter for Nauticam Ports V2

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

    SKU: ISO-3977

    Isotta to Nauticam Port Adapter Ring V2   The Isotta to Nauticam Port adapter ring allows the owner of an Isotta underwater housing to use Nauticam ports on that housing. Features: Black anodized aluminum anticorodal; Double O-Ring seals; Max...

    $320.00
  • Sale
    Nauticam USED: Nauticam N120 Extension Ring 30 ~with Lock Nauticam USED: Nauticam N120 Extension Ring 30 ~with Lock Nauticam USED: Nauticam N120 Extension Ring 30 ~with Lock Nauticam USED: Nauticam N120 Extension Ring 30 ~with Lock

    USED: Nauticam N120 Extension Ring 30 ~with Lock

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

    SKU: USER-NAU-21130

    USED: Nauticam N120 Extension Ring 30 ~with Lock   This product is sold by a third party seller. While we do our best to vet the authenticity of the listing, we are not responsible for any inaccuracies in the listing. As the buyer, you have the...

    $375.00
    $422.00
  •  Inon S-MRS Focus Ring RF15-30

    Inon S-MRS Focus Ring RF15-30

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

    SKU: INO-4570018120671

    Inon S-MRS Focus Ring RF15-30   Tailored magnet ring for Canon "RF15-30mm F4.5-6.3 IS STM".In combination with compatible "MRS EXT. Ring 54", it enables "RF15-30mm F4.5-6.3 IS STM" focus operation. Canon "RF15-30mm F4.5-6.3 IS STM" can...

    $220.00
  •  Inon S-MRS Zoom Ring RF15-30

    Inon S-MRS Zoom Ring RF15-30

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

    SKU: INO-4570018120688

    Inon S-MRS Zoom Ring RF15-30   Tailored magnet ring for Canon "RF15-30mm F4.5-6.3 IS STM". In combination with the compatible "MRS EXT. Ring 54", it enables zoom operation of the "RF15-30mm F4.5-6.3 IS STM".   Extension Specifications Weight...

    $220.00
  •  Inon S-MRS Magnet Ring S70 Set  Inon S-MRS Magnet Ring S70 Set

    Inon S-MRS Magnet Ring S70 Set

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

    SKU: INO-4570018120534

    Inon S-MRS Magnet Ring S70 Set   A set of "S-MRS Magnet Ring" and "Magnet Ring Adapter S70". Attaching on the Sigma "70mm F2.8 DG MACRO" lens enables manual focus operation. Only "MRS EXT. Ring 33" and "MRS EXT. Ring 111" are usable. Other MRS...

    $99.00
  •  Inon S-MRS Magnet Ring RF35 Set  Inon S-MRS Magnet Ring RF35 Set

    Inon S-MRS Magnet Ring RF35 Set

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

    SKU: INO-4570018120527

    Inon S-MRS Magnet Ring RF35 Set   A set of "S-MRS Magnet Ring" and "Magnet Ring Adapter RF35". Attaching on the Canon "RF35mm F1.8 MACRO IS STM" lens enables manual focus operation. Only "MRS EXT. Ring 33" and "MRS EXT. Ring 111" are usable. Other...

    $99.00
  •  Inon Extension Ring 18

    Inon Extension Ring 18

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

    SKU: INO-4562121435872

    Inon Extension Ring 18   An extension ring with effective length of 18mm using M96 male/female threaded mounts. For use with Canon "EF8-15mm F4L Fisheye USM" + "Mount Adapter EF-EOS R" in combination with "MRS EXT. Ring 33" and "M86 Dome Port 115". ...

    $154.00
  •  Isotta Extension Ring 30 mm

    Isotta Extension Ring 30 mm

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

    SKU: ISO-1380

    Isotta 30mm Extension Ring B102 for Isotta Housings 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.   Please see Isotta Port Chart We dive with our...

    $157.00
  •  Nauticam N100 35II Extension Ring

    Nauticam N100 35II Extension Ring

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

    SKU: NAU-37431

    Nauticam N100 35II Extension Ring Part #: Nau-37431 Product Overview: Nauticam Extension Ring 35II is designed to be used with N100 port system and has an effective length of 35mm Please see Nauticam Port Chart We dive with our products all the...

    $474.00
  • Sale
    Nauticam USED: Nauticam Mini Extension Ring 20

    USED: Nauticam Mini Extension Ring 20

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

    SKU: NAU-36620-USED-3

    USED: Nauticam Mini Extension Ring 20 Condition: Very Good   Part #: Nau-36620 Product Overview: This extension ring allows you to use you Olympus Zuiko 60mm macro lens with your current Nauticam Macro Port 45.      Please see...

    $213.30
    $237.00
  • Sale
    Nauticam USED: Nauticam N85 to N120 34.7MM Port Adaptor

    USED: Nauticam N85 to N120 34.7MM Port Adaptor

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

    SKU: NAU-36064-USED-4

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

    $516.80
    $544.00
  • Sale
    Nauticam USED: Nauticam N85 to N120 55mm Port Adapter with Lens Control Knob

    USED: Nauticam N85 to N120 55mm Port Adapter with Lens Control Knob

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

    SKU: NAU-36401-USED-4

    USED: Nauticam N85 to N120 55mm Port Adapter with Lens Control Knob Part #: Nau-36401   Condition: Like New Product Overview: The Nauticam port adapter converts your N85 port opening to accomodate N120 ports.  It also has an integrated lens...

    $650.75
    $685.00
  • Sale
    Nauticam USED: Nauticam N85-N120 50mm Port Adaptor II

    USED: Nauticam N85-N120 50mm Port Adaptor II

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

    SKU: NAU-36207-USED-4

    USED: Nauticam N85-N120 50mm Port Adaptor II   Condition: Excellent An adapter to convert from an N85 port opening to N120 port opening to use with N85 Sony housings. Adaptor Features Material: anodised aluminium Nominal depth 100 m Effective...

    $626.05
    $659.00
  • Sale
     Nauticam N85 to N120 34.7MM Port Adaptor - USED

    Nauticam N85 to N120 34.7MM Port Adaptor - USED

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

    SKU: NAU-36064-RNTL

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

    $490.00
    $544.00
  •  Sea & Sea DX Extension Ring 40L

    Sea & Sea DX Extension Ring 40L

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

    SKU: SS-30145

    Sea & Sea DX Extension Ring 40L with Lock Product Overview: The Sea & Sea Extension Ring 40L with Lock extends your port system by 40mm and it features a safety lock to avoid accidental unscrewing of the port. Specifications: Depth Rating: 100m...

    $299.95
  •  Sea & Sea DX Extension Ring 30L

    Sea & Sea DX Extension Ring 30L

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

    SKU: SS-30144

    Sea & Sea DX Extension Ring 30L with Lock Product Overview: The Sea & Sea Extension Ring 30L with Lock extends your port system by 30mm and it features a safety lock to avoid accidental unscrewing of the port. Specifications: Depth Rating: 100m...

    $284.95
  •  Sea & Sea DX Extension Ring 20L

    Sea & Sea DX Extension Ring 20L

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

    SKU: SS-30143

    Sea & Sea DX Extension Ring 20L with Lock Product Overview: The Sea & Sea Extension Ring 20L with Lock extends your port system by 20mm and it features a safety lock to avoid accidental unscrewing of the port. Specifications: Depth Rating: 100m...

    $279.95
  • Zen Port Adapter for Olympus OM-D housing

    Zen Port Adapter for Olympus OM-D housing

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

    SKU: ZEN-PA-EP08-EP

    Zen Adapter for Olympus OM-D Housing Product Overview: This adapter will allow the use of 3 popular Zen ports with the new style mount that Olympus has incorporated on Olympus brand OM-D housing, like the EP-08 (E-M5), PT-EP11 (E-M1) and...

    $199.99
  • Sale
    Nauticam USED:  Nauticam N120 80mm Extension Ring (Type 1)

    USED: Nauticam N120 80mm Extension Ring (Type 1)

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

    SKU: NAU-21180.0

    USED: Nauticam N120 Extension Ring 80 (Type 1)   CONDITION: LIKE NEW Product Overview: The Nauticam N120 Extension Ring 80 II has been designed to extend the port by 80mm (effective length) and popularly used with these lenses. Nikon 14-24mm Nikon...

    $437.00
    $510.00
  • Sale
    Nauticam USED: Nauticam N120 Bayonet Ring for Sea & Sea ports

    USED: Nauticam N120 Bayonet Ring for Sea & Sea ports

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

    SKU: SS-30203-USED-1

    USED: Nauticam N120 Bayonet Ring for Sea & Sea ports   Condition: Excellent Product Overview: This bayonet ring allows for the attachment of Sea & Sea ports to Nauticam housings - N120 port mounts.   We offer lifetime support with all...

    $32.95
    $56.00
  • Sale
     Nauticam N85 to N120 55mm Port Adapter with Lens Control Knob - USED

    Nauticam N85 to N120 55mm Port Adapter with Lens Control Knob - USED

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

    SKU: NAU-36401-RNTL

    Nauticam N85 to N120 55mm Port Adapter with Lens Control Knob *THIS IS A USED ITEM   Part #: Nau-36401 Product Overview: The Nauticam port adapter converts your N85 port opening to accommodate N120 ports.  It also has an integrated lens control...

    $616.50
    $685.00
48 of 140 Items

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