ISO figure noise starts become visible : ISO6400 ISO figure noise overwhelms image : ISO25600 Interested ? Help support ePHOTOzine using links.Amazon UK Amazon US Olympus OM-D E-M10 Mark IV The standard ISO range ISO200 ISO25600 , extended ISO100 ( Low ) .This results slight loss dynamic range.Noise low ISO100 ISO800 , noise creeping ISO1600.Noise reduction good job controlling noise ISO3200 , however , fine detail reduced speed.Noise ISO6400 n't intrusive , results could still useful use web ( resized ) , depending needs.Noise becomes stronger ISO12800 , 's likely wo n't want use speed unless option.Colour saturation remains good however even ISO12800.ISO25600 best avoided.You adjust noise reduction options , may want set Low rather normal/standard want little detail , albeit slight increase noise .