Results may still usable depending needs , colour saturation remains good even ISO51200.Noise high ISO102400 , settings best avoided.Noise reduction options include Off , Low , Normal , High , default Normal.These photos taken default settings.ISO figure noise starts become visible : ISO12800 ISO figure noise overwhelms image : ISO102400 Interested ? Help support ePHOTOzine using links.Amazon UK Amazon US Nikon Z7 II The Z7 II offers full-frame 45mp BSI CMOS sensor able offer high-resolution images.When combined extremely high-quality Z series lenses , 'll find extremely impressed image quality offer camera.Noise low ISO32 way ISO1600.Fine detail starts drop ISO1600/ISO3200 continues go ISO6400.Noise becomes noticeable ISO12800 , ISO25600.Results may still usable depending needs , colour saturation remains good even ISO25600 , however , best results , 'd try stay ISO12800/25600 .