This infrared filter blocks all visible light, appearing completely black, and allows for pure infrared photography without any visible red. The transmission only exceeds 1% at 800 nm, rising to 88% at 900 nm and remaining significantly above the sensitivity threshold of infrared films. Due to the lower film sensitivity utilization, this filter is less commonly used in artistic photography; however, in scientific fields, material research, and forensic science, the restriction to the pure IR range is often crucial. The filter factor is highly dependent on the lighting conditions and the properties of the film.