The Leica M8 has a relatively week IR absorbing filter with a 5% leakage in the IR. An Orange filter blocks Blue light and about 1/2 of Green light. These are shot using RAW mode to get uncompressed DNG files, then the Blue and Green channels are equalized with Red. The result is IR in the Blue channel, Vis+IR in the green channel, and RED in the red channel. Red and Blue channels swapped when creating a new DNG file to make IR look red.