Advanced, high-performance Speedlight for Nikon digital SLR camerasMulti-step auto zoom covers wide 17-200mm zoom range (24-105mm : SB-800) Three illumination patterns (standard, center-weighted and even) are available to match each shooting environmentAutomatically detects Nikon FX and Nikon DX formats and selects suitable light distribution Improved booster circuit for high-speed recycle time: Recycle time using four AA-size batteries is almost equal to the SB-800 with five AA-size batteries New AF-Assist illumination covers a wide 20-105 mm focal range compatible with the new Multi-CAM3500 FX/DX AF sensor Flash shooting distance range  0.6 m to 20 m (2 to 66 ft) (varies depending on camera image area setting, illumination pattern, ISO sensitivity, zoom position, and lens aperture)