Sigma EF-500 DG ST Flash is specifically designed for Nikon SLRs. The EF-500 has TTL automatic flash exposure controls. It also includes S-TTL flash photography for Sigma, 3D multi-sensor balanced fill flash function and i-TTL flash photography for Nikon. The flash has great lateral and vertical head movement with 28mm to 105mm zoom range. Also, 17mm coverage with diffuser. This flash is also compatible with Canon E-TTL II flash photography and Minolta (ADI flash photography and P-TTL flash photography).