Nikon SB-910 flash is Nikon's flagship flash is the most advanced in the range of the flash. Nikon SB-910 progress lighting mastery by providing easy operation and navigation menus, SB-910 can work as stand-alone flash, or as part of the wireless group, either in Commander mode or as a slave (remote). I-TTL system in flash supports Advanced Wireless Lighting and versatile functions for up to four groups of Speedlights, with 3 remote i-TTL flash groups controlled through the master SB-TTL Balanced Fill 910.i-Flash flash control employs Nikon's advanced Data Communications Systems . The system provides a better method to monitor pre-flash and wireless operation that marks an evolution in higher precisionit form the core of the Creative Lighting System.