I had a lightweight manfrotto pistol grip ball head tripod. It didn't cope well with the weight of the camera especially with the 150-600 lens. Legs too thin to use fully extended and grip had to be TIGHT to lock the ball. I got the Manfrotto 055 CF legs only and fitted my spare 3 axis head. OK it weighs around 3kg but that is nothing compared to just how sturdy it is. I now leave the 150-600 at home unless I am going to need it. Makes room in my backpack for flask & bait.