Extension Rings & Port Adapters

Port extensions can serve two purposes in underwater photography, one is purely physical in nature, it simply extends the length of a port to accommodate a longer lens or one equipped with accessories such as tele converter, as it is frequently the case with macro photographic configuration. The other has a direct influence on the optical performance of a lens, the extension ring being used, in this instance, for positioning a dome port as closely possible to a wide angle lens optical center. The wider the lens, the more critical this positioning will becomes, especially true of rectilinear type wide angle lenses covering field of views upward of 90 degrees.

Aquatica has gone to great extent to provide you with the best tools for your photographic needs, providing you with no less than thirteen port extension rings, including four with manual focusing knobs on them, ranging in size from 16.5mm /.65” to a full 97.5mm / 3.82”. This, along with the broad selection of ports at your disposition, makes Aquatica one of the, if not the most, comprehensive and accurate underwater photography system existing at the present.

Dimensions shown are (A) the actual length that the extension rings provides between a housing and a port, if you wish to know the overall physical dimension of an extension, add the bayonet length of .5″ /12.5mm (B) to the (A) measurement.

Every extension ring we manufacture is made of high grade 6061 T6 aluminum alloy, anodized to military specs and pressure tested to a depth in excess of 300ft / 90m. A sturdy, trouble free stainless steel locking mechanism insure that your port is reliably  locked to the extension ring, the latter being safely held in place by the housing own locking mechanism.

To learn how to properly measure for an extension, please refer to our Extension Dimension Chart (PDF).

Available Products

Extension Rings

30600

$169.00 USD

Port extension ring

Extension Rings

30601

$169.00 USD

Port extension ring

Extension Rings

30602

$179.00 USD

Port extension ring

Extension Rings

30603

$179.00 USD

Port extension ring: 23,5mm ,95"

Extension Rings

30604

$179.00 USD

Port extension ring: 52mm / 2.oo"

Extension Rings

30605

$179.00 USD

Port extension ring

Extension Rings

30616

$195.00 USD

Step Up extension ring

Extension Rings

48453

$249.00 USD

Port Extension Ring; 28.5 mm / 1.12”

Extension Rings

48454

$349.00 USD

Port Extension Ring; 97.5mm / 3.82"

Extension Rings

48455

$249.00 USD

Port Extension Ring; 25.5mm / 1.02”

Extension Rings

48456

$249.00 USD

Port Extension Ring; 16.5mm / .65”

Extension Rings

48457

$310.00 USD

Port Extension Ring; 54.5mm / 2.135”

Extension Rings

48458

$310.00 USD

Port Extension Ring; 63.5mm / 2.50”

Extension Rings

48459

$310.00 USD

Port Extension Ring; 74.5mm / 2.93"

Extension Rings

48460

$249.00 USD

Port extension ring

Extension Rings

48461

$249.00 USD

Port extension ring

Extension Rings

48462

$249.00 USD

Port Extension Ring; 39.5mm / 1.56”

Extension Rings

48463

$249.00 USD

Port Extension Ring; 21.5mm / .82”

Extension Rings

48468

$349.00 USD

Port Extension Ring; 89.5mm / 3.51"

Extension Rings

48469

$399.00 USD

Port extension ring

Extension Rings

48471

$310.00 USD

Port extension ring

Extension Rings

48473

$310.00 USD

Port extension ring

Extension Rings

48474

$349.00 USD

Port extension adapter for EF lenses to be used on A5R housing

Port Extensions with Manual Focusing Control

The following extension rings have a manual focusing knob on their side, these require that a focusing gear be attached to the lens, note that these gears are sold separately. Please refer to your housing’s lens chart for compatibility and availability.

Extension Rings Manual

30620

$399.00 USD

*Port extension ring with focus knob ( a focus gear is required, sold separately)

Extension Rings Manual

30621

$399.00 USD

*Port extension ring with focus knob ( a focus gear is required, sold separately)

Extension Rings Manual

48464

$399.00 USD

Port extension with manual focus knob 74.5mm / 2.93"

Extension Rings Manual

48465

$399.00 USD

Port extension with manual focus knob 63.5mm / 2.50"

Extension Rings Manual

48466

$399.00 USD

Port extension with manual focus knob; 96.5mm / 3.81”

Extension Rings Manual

48467

$399.00 USD

Port extension with manual focus knob; 89.5mm / 3.51"

Extension Rings Manual

48470

$399.00 USD

Port extension with focus knob for Sony 12-24mm f/4 G

Extension Rings Manual

48475

$399.00 USD

(*)Port extension with focus knob (a focus gear is required, not included)