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.RX100 III test data on DxO Mark XF1 test data on DxO Mark
Cool retro styling bolstered by a quality build and design; Fast f/1.8 lens at wide angle; Fast autofocus and low shutter lag; Tons of customizability and creative options, including Fuji's special EXR and Film Simulation modes; Full 1080p HD video; PASM controls; RAW still capture.
Special modes have somewhat steep learning curve; Maximum aperture drops quickly as you zoom; Lens cover doesn't lock when storing; Larger sensor doesn't necessarily translate to better photo quality than competitors; Demosaicing errors and moderately high chromatic aberration.
Pocket-friendly design; Popup electronic viewfinder; Bright lens across the zoom range; Great performance with very fast autofocus; Very high resolution gives lots of detail in good light; High ISO noise levels much better than most pocket camera rivals; Wi-Fi wireless networking
Feels a little unbalanced without an accessory grip; Not as much telephoto reach as its siblings; Noise processing is heavier-handed than in earlier models; Quite pricey for a fixed-lens camera