Infrared Photography with a Digital Camera. Fogging Certain cameras or lenses may exhibit some fogging, or image areas with extra exposure (for example, a bright central spot seen with many Canon lenses).
This may be due to light scattered from inner surfaces of the lens, or to some peculiarities of anti-reflective lens coating which was not really designed for infrared. Sometimes the blackness of internal surfaces of the lens tube or mirror chamber may be "not black enough" in infrared. (I experienced the last effect a few years ago with an Olympus E-10, where the extreme 15% or so of many frames was ghosted.) Jackleeee. Arcipello - Daniel Conway Art.