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.P7800 test data on DxO Mark Stylus 1 test data on DxO Mark
Excellent image quality for a 1/1.7" sensor; Versatile 28-200mm eq. lens with fast f/2-4 max aperture; Built-in EVF; Fully articulating LCD; Generous set of physical controls; Built-in flash with wireless support; Standard dedicated hot shoe; Full HD and slo-mo movies.
Slow cycle times and buffer clearing with RAW files; Shallow burst mode buffer; Mediocre autofocus speed and shutter lag; Sluggish UI at times; Slow to switch to movie mode; Optical zoom not supported during movie recording when using manual exposure modes; No built-in Wi-Fi.
High-quality constant aperture 10.7x zoom lens with excellent performance; Very affordable for what it delivers; Ergonomically sound with a solid, professional feel; Highly customizable; Fast overall performance; Built-in EVF and tilting touchscreen LCD; Automatic lens cap.
Smaller sensor size than 1-inch and Micro Four Thirds models mean far lower image quality as ISO tops 800; 28mm eq. is not as wide as some competitors and not overly suited for landscape photography.