I know there are many threads about this, and many of them I have read. Most people suggest to set Noise Reduction = Auto and Noise Filter = Low. And that's what I did on my om-d and used to do on my old Epl-2 too. Today tried a different setting on om-d. Noise Reduction = On Noise Filter = High And woah! I like it much better, and at iso 3200 I can se almost no rumor nor artifacts…. Have you ever tried it? What are your iso settings?