Designed specifically for 3D front projection systems, 3D Virtual Grey is a flexible projection fabric that retains 99 percent of polarized light. Other characteristics include the ability to maintain high extinction values, virtually eliminate ghosting or crosstalk common with stereoscopic 3D projection and excellent image contrast. 3D Virtual Grey offers a 1.85 gain, which is compatible with low levels of ambient light. Gain = 1.85, Half Angle = 11 degrees.