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.MX-1 test data on DxO Mark SX50 test data on DxO Mark
50x optical zoom with whopping 24-1200mm-equivalent reach; Excellent image quality for its class; 2.8-inch vari-angle LCD; Ergonomic design and controls; Improved image stabilization and Zoom Framing Assist; Shoots RAW; Full 1080p HD video.
Poor low-light AF performance; Image quality deteriorates at ISO 800 and above; Sluggish cycle times; Below average battery life.
Good 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.