I'm looking now, and my highest useable ISO was 16,000. Which I agree, is VERY good! I just want people to be careful because I see a lot of "it can go up to ISO.............etc." Just be careful and realize that the overall lighting matters too and 25,600 is really pushing the quality. I am however, very happy that it performs at as high of ISO's as it does. So no complaints on the camera at all. I'll use it again, so I'll have more shots to compare.