Benjamin Marks
Veteran
Here are a couple of examples of the IR response of the M9. 35 mm Summaron lens with a visual light cut filter on the front. Hyperfocal focus, tripod, and exposure set to "Auto." I then tweaked the files in Photoshop to remove the magenta color and adjust the exposure a bit:


I mainly insert these to demonstrate that even post M8 models do have a usable IR response with the factory CCD intact. I'd love to have an M10 or M11 for a side-by-sde test.
Ironically, I own the filter/lens combination because I wanted to explore the IR response of the M8, which was this camera's predecessor in my cabinet. I definitely got my share of off-color hair with the M8 under incandescent lights when photographing women of a certain age (e.g. who use hair dye). The M9 does better, but still (as showed above) registers plenty of signal from the IR spectrum.


I mainly insert these to demonstrate that even post M8 models do have a usable IR response with the factory CCD intact. I'd love to have an M10 or M11 for a side-by-sde test.
Ironically, I own the filter/lens combination because I wanted to explore the IR response of the M8, which was this camera's predecessor in my cabinet. I definitely got my share of off-color hair with the M8 under incandescent lights when photographing women of a certain age (e.g. who use hair dye). The M9 does better, but still (as showed above) registers plenty of signal from the IR spectrum.