Making Infrared Photos
Priadi had a special camera that can take infrared photos. It's not a completely converted camera, so it requires an infrared filter.
Most cameras cannot take infrared photos, because, by design, there are infrared filter installed on the sensor to keep infrared lights out. So, even with filter than only let infrared lights through, the camera cannot make infrared photos.
With these cameras, they need to be converted; the infrared filter by the sensor need to be replaced by a neutral glass or a glass that only passes infrared lights, before the camera can take infrared photos.