Welcome Swallow. 200 shots later....
I managed to get 2-3 good ones, but, they are a challenge. The tricky bit is trying to get the 5D3 to keep up with the focus. Or, more to the point, trying to learn how to track an object that moves at random. Sometimes it works
5D3 with 300mm f4
5D mk3 with grip, 300 f4 L, 100 IS Macro L, 50 f1.4, 50 f1.8, 40 f2.8 pancake, 35 f2, 1.4x TC III, Zeiss 15mm f2.8, 24 f1.4 L
580EX II, MT-24EX Macro Flash
EF 12mm and 25mm II Extension tubes