This Ball Clamp with Ultra Blue T-Knob from Ultralight Control Systems is used to connect light arms to underwater camera rigs, or arm sections to each other, using 1" mounting balls. This clamp measures 1.5" between the centers of the ball recesses and is built around a 1/4"-28 fine thread bolt. The ultra blue anodized T-Knob makes tightening and loosening the clamp easy, and it can be useful to the cinema industry for color-coding camera rigs.

Anodized T-Knob    Useful for Color-Coding Camera Rigs    1.5" Center to Center

Related Questions and Answers

Q: 1. Will this support a Sony a7riii and a 24-70 f4 lens?

A: Yes, but a bigger head with a bit higher load capacity would be a better fit.

Q: 2. Does this truly pan 360 degrees or is panning achieved only by movement of the ball?

A: The BH-25 will pan by the movement of the ball head. The BH-30 will have a seperate panning lever. See: https://bhpho.to/2yDP42r.

Q: 3. Can this be use on Robus RC-5570 Vantage Series 3 Carbon Fiber Tripod ?

A: Yes, it is compatible with the Robus 5570.

Q: 4. Will this Ball Head mount to a Manfrotto Tripod?

A: This ball head will mount to any standard 3/8" mounting screw, which is nearly all Manfrotto tripods with a removable head.

Q: 5. Can the release plate be replaced with the Manfrotto RC-4 plate?

A: No it won't work, I just tried it on mine. The RC-4 plate is too wide for the RRS clamp and it has a profile that doesn't match up with the Arca Swiss style of the BH-55 Screw Clamp. I still use my Manfrotto systems, but prefer the RRS for heavier gear like a full size camera with battery grip and a big lens.

Q: 6. will this ballhead hold a niko d800 and 80-400 lens?

A: That lens and camera weigh nearly 6 lbs, which is too close to the load capacity of 8.8 lbs. You can never have too much capacity. This RRS ballhead would be a much better option: https://www.bhphotovideo.com/c/product/1301053-REG/really_right_stuff_bh_30_pro_bh_30_ballhead_with_mini.html

Q: 7. Will the FB-52 handle a Nikon D300s with battery pack and 400 F3.5 Nikkor lens?

A: Yes, it handles up to 44lbs, more than enough to handle this kit well.

Q: 8. Will this ballhead hold nikon d800 plus 80-400 mm lens?

A: The combined weight of the Nikon D800 DSLR camera and the Nikon is 5.43 lbs. As such, the would work to support your camera/lens setup. While it is personal preference, as a safety precaution, I typically like recommending tripod heads with a maximum load capacity that is 3x higher than the combined camera/lens setup weight. As such, my personal recommendation would usually be for the Really Right Stuff BH-40 Ball Head with B2-mAS Mini Clamp, B&H # REBH40PRO, or if you needed a head with a smaller base diameter, the Really Right Stuff BH-30 Ball Head with Mini Screw-Knob Clamp, B&H # REBH30PRO, is a good option, but yes, the Really Right Stuff BH-25 Ball Head would work for your usage needs.

Q: 9. Comparing this ball head to the smaller FB-44III ball head (BH #SUFB44III) shows this has a lower load capacity (44 lb vs 66 lb). Is this correct? Shouldn't this larger version have the greater load capacity?

A: While it may seem the FB-52 should have a larger maximum load capacity, according to Sunwayfoto's website, the Sunwayfoto FB-52 Ball Head has a maximum load capacity of 20 kg, which is 44.1 lbs. The Sunwayfoto FB-44III Ball Head has a maximum load capacity of 30 kg, which would be 66.1 lbs. If you need more assistance, you may contact Sunwayfoto directly by e-mailing them at service@sunwayfoto.com.

Q: 10. Does this compatible with Gitzo GT3543XLS Systematic Series 3 Carbon Fiber Tripod ?

A: Yes. The tripod uses a 3/8-16 threaded stud. The RRS BH-55 uses a 3/8-16 threaded insert. They work great together.