I can ' t back this scientifically , but the number is logarithmic , so an iso 2000000 shot is only 2 stops more actual light than the max available on an a 7 sii iso 496 k . Even then , it ' s only 6 stops over iso 25600 . The reduction in component sizes reduces the amount of electronic interference you had with older sensors , and moving where the electronics are situated improved light gathering , combined with really clever noise reduction algorithms means you gain an extra stop of light for equivalent noise quite easily . It ' s astonishing to see , and there ' s a ton of wizardry involved , but it ' s not as big a gain as the numbers would suggest . <| sep |> Where did you get that ? That ' s awesome . <| sep |> Because I can still hear the beating of his telltale heart .