With a rated guide number of 92' at ISO 100 and 35mm, the SB-700 AF Speedlight from Nikon is a moderately compact flash unit packed with features for high-performance on-camera lighting capabilities. The flash is compatible with the i-TTL system for automatic metering with both FX- and DX-format cameras and is optimized for use with Nikon's Creative Lighting System for complete control over your lighting setup. Additionally, the auto zoom head has a coverage range of 24-120mm with FX-format cameras which can be extended down to 12mm with the use of the built-in wide-angle diffusion panel.