Get Leica M Monochrom Typ 246 at B&H Photo.
I show and discuss visible light versus infrared and why a B+W 489 IR-cut filter might be helpful for all-around shooting. Also shown are examples with both the B+W 092 Infrared Pass filter (680 nm cutoff), (3) the B+W 093 Infrared Pass filter(850 nm cutoff).
It might be possible to modify an MM246 for infrared use by removing its IR-blocking sensor cover glass and replacing with clear glass. In a way it’s curious that Leica does not simply offer this kind of option up front, since the MM is already a very specialized model. It would make more sense than the dubious celebrity special edition models Leica emits so frequently.