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.
GM5 test data on DxO Mark S100 test data on DxO MarkSlimmer than past models; 12-megapixel resolution sensor improves on image quality across ISO range; Video includes 1080p, autofocus, and zoom during recording; HDR mode works well.
Costs $30 more; Slight buzz when zooming while recording video; Grip isn't as useful as it could be; Slow autofocus.
Great image quality for a tiny camera; Excellent high ISO for its class; Built-in EVF; Built-in hot-shoe; Improved ergonomics; Improved image quality for long exposures; Improved burst rate with hybrid shutter; 1080/60p video.
Slightly bigger than GM1 (but not by much); No built-in flash; Shallow buffers with RAW files; Dynamic range not quite as good as some competing models; Below average battery life.
