Regarding the Leica M8's infrared sensitivity, does anyone know, or know how to find, how far into the infrared in nm the sensor is sensitive. To compare, according to my book, Kodak HIE was sensitive to 900nm. Konica went to 820. Ilford SFX to 740nm. In practice I can get noticeable infrared effects with a red filter or a Leica IR filter (frequency of the Leica IR is unknown, never been able to figure that out either but seems a little darker than a 25A). It seems to me to be more than SFX is capable of, but less than HIE significantly. If I had to guess (and I'd probably be wrong) I'd guess somewhere between 750 and 800nm. But what is the real answer? Does anyone know? Has Leica ever published this as part of the specs of the camera (bought mine used, don't even think I have a manual). Thanks! P.S. Like the frequency range of the Leica 39mm IR filter, I suspect this may be a question nobody knows the answer to, but if I'm wrong, I'd like to know.