The Profoto OCF Magnum Reflector works with the Profoto D2, D1, B1X, B1, B2, B10, B10X and B10X Plus flash heads. It allows you to adjust the beam angle of these lights from 40 to 80 degrees by moving the reflector back and forth along the body of the light. Great for long-throw use, the highly reflective modifier will boost the output 1.8 stops.