This is an attachment for tripod heads designed to make it quicker to remove the camera for handheld photography and re-attach it. You attach the quick release plate to the camera with a slotted screw or butterfly nut, then clip the quick release plate on to the tripod head with a sprung catch or a locking screw. Quick release plates come in different types, but the closest to a universal standard is the Arca Swiss plate.
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