Based on the original DDC-100, we modify the locking mechanism from lever-release to screw knob, which makes the clamp be compatible with more QR plates. The 110mm ultra-long dovetail groove maximizes the contact area with QR plates; 50mm lock knob will go with most ball heads available in the market for large-format cameras; two screw threads of UNC1/4 and 3/8 at the base to be applied to more products and telephoto lens;
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