It slowly falls ISO12800 really looking emergency use , image deemed better image.ISO figure noise starts become visible : ISO6400 ISO figure noise overwhelms image : ISO51200 Interested ? Help support ePHOTOzine using links.Amazon UK Amazon US Sony A6600 The A6600 gives good noise performance , low levels noise , good levels detail ISO3200/6400.As ISO speed increased detail drops , fine detail beginning drop ISO6400.The camera handles noise well , images taken ISO speeds ISO3200 ISO6400 usable , depending needs.At ISO12800 ISO25600 image noise increases , detail drops further.ISO51200 best avoided noise levels high.There options set minimum shutter speed ( menu 1 , page 8 ) , well noise reduction options Normal , Low High ( menu 1 , page 1 ) .Noise performance improved Sony Alpha A6500 , better detail retention ISO3200 ISO6400 .