Inside the 501HDV is a powerful new feature that takes its inspiration from our top professional video head models – a fixed counterbalance spring (set for a typical weight of camera + accessories of 2.5kg) that helps ensure both smoother tilt movements and greater equipment safety even when tilt locks are inadvertently left off. The easy-to-reach on/off switch allows the counterbalance system to be disengaged or re-engaged for different filming setups. But from the outside, the first thing that you’ll notice about the new 501HDV video head is its updated design – completely retuned for much improved ergonomics with locks and knobs that allow a more solid grip and better fingertip control. The 501HDV inherits its separate pan and tilt locks, gradual tilt friction adjustment system, flat base (with standard 3/8” thread), quick release camera plate and repositionable pan bar from its successful predecessor.