Olympus's noise reduction setting is accessed from the menu (Custom Menu E: Noise Filter), with four options available (Off, Low, Standard and High). Confusingly there's also a 'Noise Reduction' control, but this only applies to long exposures. We've generally found Olympus's 'Standard' setting to be over-enthusiastic for our tastes, with a tendency to smear fine low-contrast detail at both intermediate and high ISOs (it seems optimised much more for print than on-screen viewing). Here you can see that turning the Noise Filter to 'Off' or 'Low' gives a bit more detail at ISOs up to 3200, without too much additional noise.