I have read about that Leica M8 usually has a IR cut filter to deal with the red blown out, which is actually caused by IR.
For example B+W 486 46MM UV/IR CUT FILTER
Personally I use DP1, also noticed that anything generate heat will give DP1 a boost in red, first toward magenta then even reach the yellow, so such kind of a filter should be very helpful, today I have to underexposure 2-3 stops in order to get the red light exposure correct, that is simply too much!
For example B+W 486 46MM UV/IR CUT FILTER
Personally I use DP1, also noticed that anything generate heat will give DP1 a boost in red, first toward magenta then even reach the yellow, so such kind of a filter should be very helpful, today I have to underexposure 2-3 stops in order to get the red light exposure correct, that is simply too much!