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.Z6 test data on DxO Mark A6500 test data on DxO Mark
Comfortable, premium body with good controls; Touch-screen for subject selection; Hybrid image stabilization system; Excellent image quality; Better high ISO JPEGs than the A6300; Extremely fast 11.1 fps burst capture; Very deep buffers for raw and JPEG alike; 4K video capture with no pixel binning
Pricey for an APS-C camera; JPEG colors aren't the most accurate; Very slow buffer clearing; Laggy touch-pad AF function; Poorly-placed movie button; No headphone jack; Mediocre battery life
Great image quality; Terrific high ISO performance; Fast AF speeds; Eye AF; Swift 12fps burst shooting; In-body image stabilization; High-quality 4K video; Robust build quality; Familiar Nikon design.
Single XQD card slot; Default high ISO NR a bit strong; No 4K 60p; 1/200s x-sync speed; Limited native lens selection (at this time).