Nikon SB-900 Flash

Multi-step auto zoom covers wide 17-200mm zoom range (24-105mmSB-800), Three illumination patterns (standard, center-weighted and even) are available to match each shooting environment, Automatically 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, Firmware update via Nikon D3 and D700 is possible (world's first*), Thermal Cut-out function limits the number of flashes to avoid deterioration of light emitting parts caused by continuous flash firing Automatically detects color filters (fluorescent or incandescent), enabling camera to control color temperature according to filter information from SB-900, Optional Water Guard WG-AS1 (for D3), WG-AS2 (for D300), and WG-AS3 (for D700) is useful for protecting the camera's hot shoe contact when the SB-900 is mounted on these Nikon digital SLR cameras