The Profoto ProDisc Reflector is designed to use with an umbrella. It keeps light from spilling off the edges of the umbrella. The Profoto ProDisc Reflector is compact and lightweight so you can pack it up and take it on all of your shoots. You can add a barndoor or a snoot to the ProDisc or use it without an umbrella as direct light. The ProDisc Reflector is compatible with all Profoto flash heads except the D1.