The NiSi JetMag Pro UV/IR CUTUV/IR cut filters are a necessity for many Blackmagic and RED users who have full spectrum sensors (no high-pass/low-pass filter on the sensor). This filter blocks the infrared and ultra-violet parts of the spectrum, to ensure optimal colour. This is especially critical for darker reflective surfaces, which can reflect a lot of infrared light and completely ruin the camera’s colour interpretation of those areas.