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.E-M1 II test data on DxO Mark RX10 II test data on DxO Mark
Excellent build quality; Superb viewfinder; Excellent image and video quality for its class; Bright and versatile zoom lens; Very fast autofocus; Great burst performance and depth; Incredible slow-motion capabilities; Really intuitive Wi-Fi image transfer; Good battery life.
Expensive compared to its nearest competitors; Less zoom reach than rivals; Soft in corners wide-open; Slow buffer clearing; Small rear control dial has poor tactile feedback; Long delay to render each high frame-rate movie; No tilt/swivel or touch on the LCD panel.
Excellent image quality; Very good dynamic range & high ISO performance; Fantastic C-AF performance; Incredible burst rates, even with RAW; 4K UHD & Cinema 4K (DCI) video; Clean HDMI; Dual SD card slots.
Expensive; Menus still confusing; UHS-II support only on one card slot; No optical low-pass filter means greater risk of moire; No built-in flash.