Originally Posted by fishywishy
open it up and take out the icf
Yes, if the Infrared Cut Filter (ICF) is removed, practically any camera should be able to see near-IR light. The difficulty is that some cameras/camcorders use a coated lens as the ICF, which means that focusing will be messed up if it is removed. As long as the ICF is a separate, flat sheet of glass right next to the sensor, there should be no problems focusing after it is removed (been there, done that).
Originally Posted by dnoyeB
Are you sure all it needs to do is see IR light? How would you play that back since it would still not be viewable. Do you perform a shift in an editor or something?
Camera sensors (both CCD and CMOS) can see a rather wide range of frequencies beyond visible light. The sensor's pixels also have no concept of color. So, to get color, a Bayer Filter is employed inside the sensor. The Bayer Filter is basically a mask of alternating red/green, green/blue filters. With this filter, certain pixels can only see red, some only blue, and some only green. However, those filters are "leaky" and will let some IR light through. Also remember that the sensor itself doesn't have any concept of color; the software interpreting the data from the sensor has to know what color filter is over each pixel. Then, the data is encoded in the YCbCr colorspace using either JPEG (photo), or H.264 (video). Thus, no colors beyond the YcBcR colorspace are physically encoded. To see near-IR light, we are depending on the "leakage" of the Bayer Filters to allow some IR light to reach the individual red, green, and blue filtered pixels. Generally, the green filter leaks very little IR light, while the red and blue filters are quite leaky to IR light. Because of this, IR light is seen as purple in photos (or videos) shot with a color camera where the ICF has been removed.