I have a Canon 5D with a RRS L-bracket and a Canon 400mm 5.6 lens. I get quite a bit of wobble whether I mount the camera to the tripod head, or if I use the lens collar (which has a RRS lens plate). I have looked into using an RRS camera bar and their clamps, but they are not practical since I change from landscape to portrait, depending on the subject. Is there a company that makes dedicated camera bars for certain lens/camera combinations, or a camera bar that will adapt to changes in base height of the lens collar and camera?