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.D600 test data on DxO Mark D7000 test data on DxO Mark
Very good image quality; Better than average noise vs. detail handling at high ISOs; Very good dynamic range in JPEGs, excellent in RAW files; Lots of high-end features in a relatively compact body; 6 fps burst mode.
Viewfinder not as accurate as specified; Viewfinder doesn't show ISO unless adjusting; No live histogram in Live View mode; No phase-detect Live View AF mode.
Great controls for amateur or pro; Good grip and heft; Impressive low-light performance; Very good dynamic range; Excellent battery life; Built-in lens correction.
Dust and oil spatter problem; Moire problem with certain subjects; Slower X-sync speed; Slow AF in Live view mode; Aliasing in videos.