I have finally acquired what I need to use a number of my lenses for IR imaging and here are the results of my assessments. I shot with the following lenses to date and have found many of them create hotspots unfortunately. There is a chance that these results are compounded by the fact that my OM-D is unconverted, but I doubt it. Panny 20/1.7 - Good, balanced image Panny 14-140/4.0-5.8 - Creates hotspot dead center Oly 12/2.0 - Creates hotspot dead center Oly 45/1.7 - Creates a slight hospot in center and tendancy to flare (but could have been a shooting directional error) Oly 75/1.8 - Creates hotspot dead center Voigtlander 58/1.4 - major hotspot dead center So from my quick testing (using relatively inexpensive filters by the way) the only lens I have had what I interpret as success with is the Panny 20/1.7. I'll add more to this thread as I learn more about these lenses, filter quality and use on other cameras. Late addition and surprising revelation: Nikkor 28mm f/2.8 - Extremely balance, no hotspots or flaring I should comment that I need to reset my Custom White Balance since I would expect a much bluer sky after PP, although the fact that the camera has not been converted (and still has the IRC filter on it) may also be a factor. And in case you are wondering what color these flowers (in the unfocused foreground) are, here is an unfiltered visible light image.