Monopod setup for 100-400
Personally I prefer to use a ballhead with the sidekick mounted on a monopod for things like BIF. However, for most of my shooting I just mount the lens directly to the monopod.
I'd recommend you look at the gitzo line of pods...I'm using the 1588 model which might be a little overkill for the 100-400 but worth it if you're planning on getting bigger lenses in the future.
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