ISO figure noise starts become visible : ISO25600 ISO figure noise overwhelms image : ISO102400 Interested ? Help support ePHOTOzine using links.Amazon UK Amazon US Pentax K-1 II The Pentax K-1 Mark II performs well offers good value money number unique features.The camera 's ISO range goes ISO100 ISO819200.Noise low ISO100 ISO3200 , noise creeping ISO6400.At lower ISO settings , may want use custom noise options set camera lower noise reduction retain much detail possible.However , 'd still happy using camera ISO12800 , noise quite grainy ( would say film-like ) , red , green blue dots spoiling image.Noise performance ISO12800 reasonably good , slightly better result Pentax K-1 Mark II , compared K-1 , raw files also look better.At ISO25600 noise becomes stronger 'd recommend avoiding setting higher unless going process raw files resize images use web .