SB-900AF Speedlight

Control up to 3 remote Speedlight groups and an unlimited number of compatible Speedlights
FX/DX format identification
Expanded Auto Power Zoom Coverage from 17-200mm in FX-format

The SB-900 i-TTL Speedlight leads the Nikon Creative Lighting System delivering the portability, power and versatility to support any photographers creative lighting imagination.

A new high-powered flash developed specifically for digital SLR cameras. GN28 at 12 mm focal length (equivalent to 24 mm on a 35mm film camera); GN50 at 42 mm focal length (equivalent to 85 mm on a 35mm film camera). Automatically adjust the flash coverage to the lens when zooming, or set it manually. A wide range of features are also available, including redeye reduction, slow synchro, and second-curtain synchro. GN is equivalent to ISO-100.