Camera bar for Canon 5D and 400mm lens?

[spotmeter]

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?

[Nill Toulme]

You need to figure out exactly where in your setup the wobble is located.  I'm guessing that a bar is not the answer; it's more likely to be a better head or something else in the system.

Nill
~~
www.toulme.net