Just thought about another way of using the Capture clip system. Instead of using the tripod female thread on the bottom of the camera itself, why not use the tripod collar of the 70-200 or the 100-400? Has anyone used it this way?
I assume you're meaning putting the quick release plate on the tripod collar? If so, yes; sort of. That part works when transferring over to an actual tripod, but when you're mounting it to the clip on your body it doesn't work well. The foot pushes the whole system too far out, which levers everything at an awkward angle.



