Can anyone refer me to a cross-reference of tripod head types and clamping systems used? I have been unable to find I thorough explanation within the Nikonians website or via search engines. I purchased a Manfrotto tripod and a Manfrotto ballhead with a quick-release lever. I understood, apparently incorrectly, that it was Arca-Swiss compatible. Later, I bought a Kirk L bracket which should be Arca-Swiss compatible. However, the L bracket cannot be clamped to the ballhead. The Manfrotto clamps to plates with a bevelled, angle-cut base, whereas the Kirk seems designed for a tongue and groove clamping system. In all my reading, I did determine that there are several systems out there, and I stayed away from some popular ones like RRS. I'd like to figure out what is compatible with what. Surely, someone has written about this somewhere. Thanks in advance to anyone who offers a reference.