At ISO6400 detail drops , noise/grain starts appear.At ISO12800 noise continues increase , however , effect quite `` film '' like , noise appears like grain , rather colour noise ( RGB dots ) .This remains case ISO25600 , means ISO12800 ISO25600 produce results could usable.ISO speeds available ISO100 ISO6400 Auto , ISO100 ISO25600 `` Standard '' ISO range.To go , camera `` composite low ISO expansion '' option.This takes multiple images one time merges , however , used stills photography ( video ) movement picked up.The ISO range expanded way simulated ISO6 , steps ISO80 , noise remains low.High ISO expansion lets use ISO32000 ISO1024000.ISO figure noise starts become visible : ISO6400 ISO figure noise overwhelms image : ISO25600 Interested ? Help support ePHOTOzine using links .