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.
RX100 III test data on DxO Mark MX-1 test data on DxO MarkGood image quality for a compact camera in its class; Sharp, bright f/1.8-2.5 lens with 4x optical zoom; Cool retro-styled design with brass top and bottom plates; Tilting LCD; Exposure compensation dial; Speedy and accurate autofocus; Full HD video recording.
Image detail starts dropping off noticeably above ISO 800, and noise becomes problematic at ISO 3200 and beyond; Sluggish cycle times and burst performance; Issues with purple fringing in some shooting scenarios; Heavier and larger than other cameras in its class.
Pocket-friendly design; Popup electronic viewfinder; Bright lens across the zoom range; Great performance with very fast autofocus; Very high resolution gives lots of detail in good light; High ISO noise levels much better than most pocket camera rivals; Wi-Fi wireless networking
Feels a little unbalanced without an accessory grip; Not as much telephoto reach as its siblings; Noise processing is heavier-handed than in earlier models; Quite pricey for a fixed-lens camera
