A sophisticated flash unit / Special functions with NIKON D2H, D1 and D100 Digital Cameras / Supports up to 3 slave units TTL and Non-TTL Auto Flash (A) with film cameras Intelligent i-TTL system supports Advanced Wireless Lighting, including 3 remote i-TTL Speedlight groups controlled through the master SB-800 D2H and SB-800 wireless lighting system makes operation as simple as an on-camera Speedlight Auto FP High Speed Sync Mode delivers fill flash in bright light as needed FV Lock (Flash Value Lock) allows photographer to change the composition or zoom for the shot, while maintaining desired lighting of the subject Wide-area.