94" Camera Tripod Transverse Center Column 22lbs/10kg Load With Detachable Monopod High Aluminum Video Tripod For Dslr Slr, T254a8+Bh-28l (Sa254t1)

SKU: GKF09.086C

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Your ball head could be used on our tripod as long as it has a 3/8" standard screw interface 
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If you need the rubber foot, just please contact me for help, we can help to send. 
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K&F Concept TC2534 53"carbon fiber tripod you are asking, yes, the ball head could be rotated to 90 degrees ,if you need video help please let us know. and please trust to purchase. 
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as long as the gopro has a standard 1/4 screw mount, it could work with this tripod. 
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For how to install the center column, please refer to this video https://youtu.be/3BvJKWNElRg. 
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No. I bought it based on the claim that it would support the weight, but it doesn't. However, i have found that if I don't try to use the cantilevered function, but just use the height of the combined tripod and arm (straight up) and the ball joint holding the binoculars, I have more than enough height to see anything up to about 75 degrees comfortably. In the video, the eyepieces are at 6', and there is easily another foot of extension available. 
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Yes, it has a level bubble. If you look closely in the photographs, there is a round shape near where the camera locks on. That is where the level bubble resides, in the circular protrusion with light green inside. It's hard to see in the photos due to the angles, but it's definitely there! I have this tripod and use the bubble all the time. 
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For how to install the foot locking system, please refer to this video https://youtu.be/jZb6Fn6T_u0. 
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To hold telephoto lens, it is recommended to use a tripod mount ring additionally for better balance. Meanwhile, it is better to hang some heavy thing to the hook to lower the center of gravity on this tripod to make it more sturdy and less prone to vibrations.