These pictures were shot with a real infra-red camera. I mean the real thing; long wave-lengt thermal imaging camera. The pictures show how much heat radiation different parts of the camera emit.

A couple of pictures are also equipped with temperature scales. Unfortunately, the accuracy of the temperature measurement varies a lot depending on the material. The IR camera can't measure the temperature directly - it can only measure the amount of heat radiation.

The amount of heat radiation depends on two factors: surface temperature and emission coefficient. The emission coefficient of most materials, painted surfaces (no matter what the visible color is, black or white), wood, the human skin etc. is very high, near 0.95. This is also the value the camera is calibrated for. The main exception are metallic surfaces, especially shiny ones (the shutter release button!), which have a very low emission coefficient. Such surfaces are more like mirrors, they don't absorb or emit heat and, therefore, it's not possible to get an accurate temperature reading.

The D7i was on, in record mode, and the EVF was forced on when I took these pictures. I also allowed the D7i to warm up about 10 minutes before taking any pictures.