Maximum effective ISO is an estimate of the highest sensitivity at which a camera can capture excellent quality photos.
Cameras with higher effective ISO will be better choices for indoor photography, night shooting, and indoor sports photography, especially if you intend to make large prints.
You can learn more at our glossary entry.
Maximum effective ISO test data courtesy of DxO Mark.J5 test data on DxO Mark S1 test data on DxO Mark
Photographer-friendly controls; Impressive dynamic range for its class; Very fast hybrid autofocus; Fast high-speed shooting capabilities; Tilting touchscreen display.
No hot shoe or viewfinder; Aggressive noise reduction, even at base ISO; 4K video is limited to 15fps.