I think if you have it turned on it does affect RAW, but can be changed in PP (that's why it won't matter). Someone can correct me if I'm wrong.
The influence of that setting is that it reduces noise in the photo, but can also cause you to lose detail or sharpness. If you are shooting in RAW, all that can be fixed. I shoot in RAW most of the time now, but I still have my noise reduction set to the medium setting and sharpening turned on. I thought it would save time in PP, but I'm not sure it does.
I'll add, I'm certainly not an expert. I'm still learning my camera, but I keep experimenting to see what works best.
Last edited by TinaS; 12-12-2013 at 07:16 AM.