Ok now I've got my camera and lens sorted (D7100+600mm), i'm in the market for a tripod and gimbal. I'm thinking of the 3 section Manfrotto 057 and a Wimberley mkii mount. I've seen cheaper mounts (Custom Brackets CB Gimbal-LS), that are a lot cheaper and seem to be good quality. If I headed down that path then the cash left over could get me a teleconverter for the 600 ,, comments anybody ...