Control The Light, Not The Color

Modern digital cinema cameras create images with precision unlike any other tools in the history of cinematography. The manufacturers of digital cinema cameras build in very specific color science both physically at the sensor site and in the digital conversion process to delivery. 

In the quest for accurate color rendition, various amounts of visible and infrared (IR) light near and past the visible spectrum are allowed to pass onto the sensor depending on the manufacturer specifications. This is achieved with an Optical Low Pass Filter (OLPF). Often IR light can be imaged in black levels of the image when density is adding using filters because the OLPF is tuned only for light entering the lens unfiltered.

IRND filters are needed that either cut or suppress the IR light before it hits the sensor to allow for only light in the visible spectrum to