No, you don't need a head, you could just screw the monopod into the lens foot and away you go. BUT, it won't be quick release, you would need a head for this. Also, you would need to be careful about how far you tilted the monopod forward or backward, as gravity could take over and the whole lot goes crashing to the ground. With a head fitted, this swivels and tilts and the monopod stays upright. I usually put the strap around my neck to prevent this.