DR7977 Features: * Vortex is designed to be used with single lens projectors * Projected light is collimated, then diffused evenly, making the Vortex well suited for use in videowalls and rooms with tiered seating patterns * Diffusion medium is in the acrylic, so it can"t be scratched or damaged * Warranted for one year against defects in materials and workmanship Color/Finish: * Charcoal grey tint provides superior color contrast, even under harsh ambient light