Profile: Pancro Mirrors, Inc. specializes in offering neutral density filter, clear optical flat. lens cleaner, beam splitter and surface mirror. The beam splitter is a thin piece of optical-select glass with a partially reflecting, partially transmitting film on the front surface. It is used for speech prompters,( 30r/70t ratio ) studio prompters ( 30r/70t ratio) or front-projection effects.( 50/50 ratio). The front-surface mirror is the result of a vacuum deposition of aluminum on optical-select glass. It is generally used for scientific instruments and cinema effects. In operation, the front-surface mirror projects a image reflected off the first surface of the mirror, as opposed to the back surface typical of a household mirror. Because of this first-surface reflection, there is no refraction or distortion of an image.