Your garden variety DSLR camera sensor is sensitive down to the IR spectrum. Proof? Point your TV remote at the lens and hit a button on the remote. See the flashing light on the camera screen? Don't see it with your eyes? That's because the remote emits in the IR spectrum. Neither I or my friend who is deep into digital photography have seen any "entities" in our viewfinders or photos. Security systems and game cameras are sensitive into the IR spectrum and the better "stealth" ones emit IR energy. Seen any "entities" there? No? Neither have I or the billions of hours of IR-based surveillance data.

Back in the chemical photography days, I found myself using and processing a good deal of Kodak Aero Infrared Ektachrome, mainly for crop and forestry studies. Guess where AIE is sensitive? Any "entities? Nope.

Don't bring urban legends here and expect them to be believed or taken as fact.