The Formatt Hot Mirror/Neutral Density Infrared (IR) Filter - Color shift is a critical factor in digital photography/videography and is directly affected by the infrared spectrum. This is particularly evident when using standard neutral density filters that absorb visible light but pass infrared. Specifically, in high definition photography, the sensitivity of imaging sensors to IR has become a challenge for both photographers, videographers and manufacturers.
Unlike many photographic films, the CCD or CMOS of a digital camera is inherently susceptible to infrared contamination, even when the manufacturer attempts to reduce this problem by adding an infrared absorbing filter on top of the image sensor. Because these filters do not have a sharp cutoff at the infrared wavelengths there has to be a compromise in order not to exclude visible red wavelengths. This results in some infrared wavelengths being allowed to pass.
While minor infrared contamination does not normally cause much of a problem for visible images, when using conventional neutral density filters especially denser grades, this issue is multiplied by the filter factor.
4 x 5.65" x3mm Hot Mirror/Neutral Density (ND) 0.9 Infrared (IR) Filter