The Tiffen 4 x 5.65" Full Spectrum IRND Filters are a combination of both an infrared control filter and a neutral density filter. An IRND is ideal for HD cameras, which have greater low-light sensitivity and, subsequently, an increased susceptibility to IR contamination. When using a standard neutral density filter to counter the increased light sensitivity afforded by the HD sensor, the effects of infrared pollution become more apparent. These filters combine an ND filter with a comparable IR control filter to eliminate the spill of infrared light reaching the sensor while still maintaining