Of those three, the 701RC2, 501 and 503, I believe only the 503 is a true fluid head
By the Way Manfrotto is having a sale right now. Buy a select model and get a
monopod or padded carrying bag for free.
What do you mean by "true". Where can I read more about this?
I want to pan some 5D2 video and it has to be super smooth and slow.
