Infrared photography is one of my greatest passions but not quite because of its rarity. It can provide a glimpse into the world that we perceive in a different spectrum, revealing sometimes uncommon effects - like highlighting previous repairs in buildings. Some effects that affect photography in the visible, for example atmospheric extinction, become almost negligible in the infrared. Thanks to a quite unknown leak in most common bayer rgb filters (see here), we can assign actual colour information to wavelengths. Red is closest to the actual red while blue shows the longest-wavelength light that the sensor can actually measure at about 1000nm.