Compact uncluttered and relatively lightweight for a head of its quality the arca swiss p0 dispenses with the usual locking knobs in favour of a locking collar which runs all the way around the base of the head so that you can lock and unlock the head from any angle of operation its an easy and intuitive way of adjusting the tilt even when wearing gloves or in difficult lighting conditions the heads asymmetrical ball is a classic arca swiss design feature which increases resistance as t