I was at a camera shop and they have Quntaray tripods. The prices were pretty good, so anyone knows about their quality? I was playing with it. When I try to tighten the knob that secures the horizontal angle, meaning the one that adjusts your camera to landscape or portrait format, it doesn't seem to be able to lock it, because no matter how hard i tighten it, I still can move it with my hand. So I was wondering if I have a heavier gear on it, it probably won't stay in place. Any ideas?