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.S1R test data on DxO Mark Z7 test data on DxO Mark
Familiar design in a compact form; Rugged build quality; Gorgeous EVF; Excellent image quality; Good autofocus; In-body image stabilization; Good 4K video recording.
Single card slot; Not as good at subject tracking as some Nikon DSLR cameras; Limited native lens selection (although adapter works well); Limited buffer depths.
Excellent high-resolution image quality; Good high ISO performance; Very fast single-shot autofocus; 4K 60p video; IBIS; Weather-sealing & comfortable ergonomics.
Contrast-detect AF system can struggle with fast-moving subjects; Burst shooting with C-AF is only 6fps; Sluggish buffer clearing; 4K video limited to 15min; Big & heavy; Expensive.