Select this modifier when you need to focus light on the Profoto monolights like the B1, B1x, D1, and D2. Not only can you vary the beam angle from 55 to 85 degrees by sliding the reflector along the body of the light, but it also intensifies the output of the unit, giving you an additional 1.2 stops! In keeping with the high portability of this kind of lighting, this reflector is only 6" in diameter for easy packing and transport.