Ultra short throw projectors have unique optical light paths that require thoughtful consideration when choosing a screen surface. WallScreen UST works beautifully for ultra short throw, front or rear projection applications. At 1 ½ by 3 ¼ inches, the frame has a steep, knife-edge profile adjacent to the fabric which minimizes vignetting due to the specific angle of incidence of ultra short throw projectors. Also a great choice for use in edge blending with multiple projectors.