The Tiffen 6.6 x 6.6" Full Spectrum IRND Filter is a combination of both an infrared control filter and 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. This filter combines an ND filter with a comparable IR control filter to eliminate the spill of infrared light reaching the sensor while still maintaining the extra exposure benefits of a neutral density filter. Please specify the Density you wish on the checkout additional information box: 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, 2.1