Digital camera sensors are typically sensitive to infrared light, but camera manufacturers install a infrared cut-off filter to block these wavelengths. If you have an old Canon point and shoot camera and want to try out infrared photography, Matthew Petroff has posted a guide to modding a Canon PowerShot SD400 for this technique. The process involves carefully disassembling the camera, removing the infrared cut-off filter and installing a visible light cut-off filter, which is simply a piece of fully exposed, developed color negative film. If seeing a camera in pieces makes you wince and you just want to take a look at the resulting photographs, here are a couple before & after shots Matthew took: