Among Nikon’s largest on-camera flash units, the SB-910 AF Speedlight brings with it excellent power, a plethora of features, and a Commander mode for wireless TTL control. The flash is compatible with the i-TTL system for automatic metering with both FX- and DX-format cameras and is a part of the Nikon Creative Lighting System for complete control over your lighting setup. Also, it features a guide number of 111.5′ at ISO 100 and 35mm for illuminating your subjects. Additionally, the auto zoom head has a coverage range of 17-200mm with FX-format cameras which can be extended down to 12mm with the use of the built-in wide-angle diffusion panel.