Nikon 4814 SB-500 AF Speedlight (Black) intelligent-Through-The-Lens (iTTL) technology tailors the characteristics of the flash to each shot you take, so you get optimal results every time Wide coverage with a guide number of 24/78.7 (ISO 100, m/ft) with 24mm coverage in FX-format and 16mm coverage in DX-format Head rotates 180 degrees left and right and tilts 90 degrees upward allowing you to bounce light off nearby surfaces to soften the light and shadows, creating more flattering portraits