I need a heavier duty tripod for a couple reasons, one being using a heavy 500mm or 800mm lens. Right now though, I need it only for the 100-400L. But I'm thinking that in the near future, I will get one of the longer primes.
Is the 2540 too lightweight for the bigger lenses? If it's OK, should I consider getting the M20 ballhead rather than the M10 I've been thinking of which will be good for right now?
P.S.: I'm a big Feisol fan, but when it comes to heavier weight, stable sticks, I will stick with Gitzo.

