A nice gem on why we need a mid-IR camera as opposed to a generic infrared camera. We often say in the research community that "mid-IR is in the fingerprint region", "there is a mid-IR transparency window in the atmosphere", "mid-IR..."...etc. In particular the lower end of the mid-infrared, 1-5 microns, has some interesting applications beginning with methane sensing.
Another important application - seeing through flames when doing thermography. Andy Whitcher highlights in this video that a portion of the mid-IR can penetrate through flames, giving clear information through, for instance, a furnace.