INON Clear Photo System film, a visible light cut filter. Place the filter over the camera's internal strobe to block all visible light when the strobe fires. With no visible light to illuminate particles between the camera and subject, backscatter is prevented. Also, no visible light from the internal strobe means no flare or ghosting from light reflecting inside the housing. The non-visible light passes through the film, transmits through the fiber optic and triggers the external strobe.