This Ball Clamp with Black 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 black 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 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: 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. Is anyone using this on a Gitzo GT2545T(Series 2 Traveler)? Or too big for the tripod?

A: If you are serious about photography, this is a very good ball head. I like it very much. Of course, when you are searching this ball head, I assume you have a good tripod too, not something wobbly cost $100 level

Q: 4. Will this fit on the Feisol TT-15 Mark 2 Mini Carbon Fiber Tabletop Tripod?

A: Yes, the Really Right Stuff BH-30 Ball Head with Mini Screw-Knob Clamp is compatible with the FEISOL TT-15 Mark 2 Mini Carbon Fiber Tabletop Tripod, B&H # FETT15M2.

Q: 5. 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: 6. 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: 7. Will this work with the peak design pro plate?

A: Yes, it will.

Q: 8. Can this be use on Robus RC-5570 Vantage Series 3 Carbon Fiber Tripod ?

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

Q: 9. How much turning is required to open/close the clamp of the screw-knob version?

A: To does not take many turns to open or close the clamp on the Really Right Stuff BH-40 Ball Head with Full-Size Screw-Knob Clamp. But if you do not want to slide the plate out and have it come from above you need to loosen it more.

Q: 10. Will the screw knob interfere with a fold down lcd screen on the D850?

A: Typically not, but if for some reason you are experiencing this issue, just turn the camera around. You can orient the camera on its L-bracket/plate with the screw knob facing forward/under the lens rather than behind the camera.