The hoya 82mm uv and ir cut filter allows only the visible spectrum of light rays to enter the camera and get captured by the sensor it does this when the lens filter is attached to your lens both higher frequency ultraviolet rays and lower frequency infrared light rays are blocked out by using the uv and ir cut filter the ccd and cmos sensors found in our cameras are extremely susceptible to catching uv and ir rays there just outside the visible spectrum and have a very negative i