Quote Originally Posted by resummerfield
I like the Arca B-2 better for heavier cameras, as it seems to give better control. Put it on a heavy wooden tripod and I'm sure it would hold way over 50 pounds.
The Arca/Swiss B-1 does hold over 50 pounds (it's rated at 65, I believe). I've gone to 40+ pounds with mine (on a carbon composite tripod) with plenty of margin remaining.