Use this 3.8" Extension Ring to increase the length of your Aquatica underwater DSLR housing's port, thus enabling the use of longer lenses, such as Canon's EF 16-35mm f/2.8L II, or teleconverters. The ring features a manual focus knob, which is compatible with a required focus gear. For complete compatibility information, please click on the links below to view the port charts.

In addition to adding length, the ring is designed to allow for positioning of the front element of your lens as close as possible to the interior of the port, in order to minimize distortion for better image quality. See the Dimensions Chart to learn how to measure properly for an extension ring.

A stainless-steel locking mechanism ensures a reliable connection between the ring and the port, while your camera housing's own lock connects the ring securely to the housing. The extension ring is crafted from a 6061 T6 aluminum alloy, which has been anodized for excellent resistance to corrosion. It features a depth rating of 295'.

Port charts:
Canon Type 1
Canon Type 2
Canon Type 4
Nikon Type 1
Nikon Type 2
Nikon Type 3
Nikon Type 4
Sony Type 4

Allows for Use of Longer Lenses, Such as Canon's EF 16-35mm f/2.8L II, or Teleconverters

Related Questions and Answers

Q: 1. Will this add on fit Sonya6500?

A: Yes it fits the A6500.

Q: 2. I am using the Olympus TG5 PT 058 housing. Is it possible to attach it without an adapter?

A: Yes, the Backscatter M52 Wide-Angle Air Lens for Olympus PT Series Underwater Housings fits the Olympus PT-058 housing without the need of an adapter.

Q: 3. Is this kit appropriate for Sony a6500?

A: Yes, the FotodioX Pro Macro Extension Kit with LED Ring Light 48a for Sony E-Mount Cameras would be compatible for use on the Sony Alpha α6500 Mirrorless Digital Camera.

Q: 4. does this fit HIK DS-2DE4A25IW-DE?

A: The Dotworkz 4K Optically Pure Vandal Tough Clear Lens for D-Series Camera Housings BH #DOKTCLNS4K mounts securely to Dotworkz D2 and D3 camera housings. Any compatibility with other cameras is purely coincidental.

Q: 5. Will this kit work with Sony nex7?

A: Yes it is compatible with the NEX 7.

Q: 6. Do you need to buy the cables separately to connect to the housing?

A: To connect the Nikon SB-N10 Underwater Speedlight Flash to a housing you need Nikon SC-N10A Coiled Underwater Fiber-Optic Cable for SB-N10 Flash. Yo need to make sure teh housing has fiber optic cable ports in order to attach teh cable. here is teh link: a href= http://www.bhphotovideo.com/c/product/1052107-REG/nikon_3775_sc_n10a_underwater_fiber_optic.html target= _blank http://www.bhphotovideo.com/c/product/1052107-REG/nikon_3775_sc_n10a_underwater_fiber_optic.html/a

Q: 7. is this a replacement lense for Hanwha SPB-PTZ7 Tinted Replacement Bubble for Outdoor PTZ Network Cameras Hanwha SPB-PTZ7?

A: The Dotworkz 4K Optically Pure Vandal Tough Clear Lens for D-Series Camera Housings BH #DOKTCLNS4K is compatible with Dotworkz D2 and D3 camera housings.

Q: 8. While using this extension cable will I lose power? If so, how much? Thank you!

A: You will lose less than 5 % of power

Q: 9. Does the auto focus work with AF-S lenses?

A: Yes. But is is much better to use manual focus with focus assist in viewfinder. Using manual focus gives the photographer much better control over focus point as depth of field becomes critical with extension tubes.

Q: 10. Getting mixed messages from reading the reviews. So, is this an original OEM Leica lens thread protection ring or not?

A: Yes, the Leica Lens Ring for Q/Q-P/Q2 (Black) is manufactured by Leica.