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.GX8 test data on DxO Mark G85 test data on DxO Mark
Highest resolution Micro Four Thirds camera yet; Great high ISO performance; Very fast autofocus; Fast burst mode with deep buffers; Impressive Dual I.S. system; Great 4K video.
No built-in flash; Slow buffer clearing; Below average battery life; Limited I.S. for 4K video.
Very good image quality; Very good high ISO performance and dynamic range; Fast and accurate autofocus; Excellent 4K video recording quality and features.
OLPF-less sensor is prone to moiré; Electronic viewfinder struggles in low light; Continuous autofocus is limited to 6fps shooting; Below average battery life.