RC2
https://youtu.be/wMdGAlmgEgM
Manfrottoの規格
明言されていないが、2種類の雲台がある
Not all tripod heads labeled RC2 are exactly the same. There are actually 2 distinct types of them, but since Manfrotto® does not officially designate between them, we'll just call them Type A and Type B. Type A is compatible with PROplate, type B is not.
Manfrotto Tripod Compatibility with Peak Design Plates – Peak Design Support Center