This arm works great. Holds tight with minimal vibration. The elbow joint is indexed so you have to loosen it a bit to adjust the angle of the elbow, but once in place it fully holds my small HD Focus 5 and large (300g NP-F970) battery with no issues extended. , also holds on to the ball all day. Very happy with this purchase so like I said if you need such a long arm and are trying to hold a small monitor or viewfinder don't be shy. Just take it.
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