I love this ball head. I chose it because the smaller ball heads crept in when using my 200-600mm lens. My weight capacity was half that, but it still moved no matter how hard I set it. B4 is rock solid. Simply press firmly on the friction knobs and it will stop all movement except panning or angle adjustment. You can still move them yourself without lens movement. The knobs are different sizes so you don't accidentally mix them up, they're rubberized for a good grip, and the Arca-Swiss connector has a feature that won't fail your rig if you ever come loose. Fantastic design. The quality is excellent, the features are excellent, I recommend. Don't confuse it with a light travel head, it's not. It's bigger and heavier, but I don't run 15 miles with my gear, so it pays to have a solid rig. I can see this head and my benro tripod will last me a lifetime it's that good.
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