I use the Benro PU-70 as a lens plate for the Sigma 3.5 / 180 macro, because it is small, flat and rounded at the edges and therefore not imposed in the camera bag, as was the case with the Giotto's plate, and, moreover, can be firmly locks with the enclosed stainless steel screw, which holds also in vertical format unshakable, even without Verdrehschutzschräubchen or whatever.