Question about Manfrotto MVH502AH, Fluid Video Tilt Head

Bought and tested. When the tele is extended to 600mm, the lens slowly lowers, as you can no longer compensate with the fixing plates. Otherwise, the part is absolutely ingenious.

I can't say that, but with a 300mm f/2.8 (3.6kg excl. camera) it's absolutely no problem, the weak point is probably the tripod....