This Helium Variable Buoyfloat Arm Extension Ring can be used to add more buoyancy to the ULTRAMAX Buoyfloat system. Made of corrosion-resistant anodized aluminum, the 2" extension segment screws into the arm assembly to add another 1/4 pound of buoyancy to your underwater photography rig.

Use with ULTRAMAX Helium Buoyfloat    Adds 1/4 Pound of Buoyancy

Related Questions and Answers

Q: 1. is it compatible with movcam wooden handgrip?

A: It is compatible with all grips that use ARRI standard rosettes including the Movcam grips such as the 303-1910 / 1911.

Q: 2. is it two extension arms or one?

A: It's exactly as shown in the picture. One arm with one screw.

Q: 3. Is it compatible with the Godox AD200 Pro?

A: No, the ULTRAMAX helium underwater strobe housing is designed and made for the AD200 unit.

Q: 4. If using this with a regular light stand and a large modifier, is a sandbag needed?

A: Any time you have off axis weight you should take precautions to ensure stability.

Q: 5. How many millimeters of extra distance does this push out the filter holder from the filter ring of the lens? I realize the height of this is 11.4mm, but the amount of extension will of course be less. Thanks!

A: The Cokin 72mm Extension Ring increase the distance beween th lens and the filter holder for 5mm. You can stack multiple rings until you get the distance needed for your composition.

Q: 6. Can I use this extension tube on my Panasonic GH3?

A: Unfortunately, the Olympus EX-25 Extension Tube is not compatible with the Panasonic GH3. The GH3 has the micro four thirds mount, while the EX-25 has the four thirds mount, which are different mounts. For the GH3, you could use any of the extension tubes for micro four thirds cameras on the following link. http://bhpho.to/1cqhXir

Q: 7. can you combine two to make it extend?

A: Yes...i have two and depending on setup use either one or two depending what I need at the time. The rosettes are standard fit I believe so should work with any arm with arri rosettes but always worth checking first, hope that helps...

Q: 8. Does it float or sink ?

A: The Buoyancy on the ULTRAMAX Helium Underwater Strobe Housing for Godox AD200 Flash is Slightly Negative. So, it will sink.

Q: 9. what are the dimensions (L x W x thickness) of a filled 25 lb bag?

A: It is approximately 20 x 7.8 x 5 inches.

Q: 10. Will this fit and work well on my Olympus OM-D E-M1?

A: The Olympus EX-25 Extension Tube will not work with micro 4/3 cameras such as the Olympus OM-D E-M1. This extension tube is designed to specifically be used with Olympus 4/3 DSLR cameras.